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Xeno-Xenillion is equal to 10102700, or a 1 followed by 1 octingennovemnonagintillion zeroes. It is 102700+1 digits long. The term was coined by Wikia user BlankEntity[1].

Written out in scientific notation of xeno-xenillion is:

101000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Writing down the full decimal expansion would take 1 octingenseptennonagintillion (102694) books of 400 pages each, with 2,500 digits on each page (except for the first, which would have 2,501).

Names in -illion systems[]

In Conway-Wechsler system,[2] \(10^{10^{2700}}\) is expressed in short scale as follows by using Fish's result.[3][4]

ten trestrigintatrecentilli(899 times)-duotrigintatrecentillion

Approximations[]

Notation Approximation
Arrow notation \(10\uparrow10\uparrow2\,700\) (exact)
Bowers' Exploding Array Function {10,{10,2700}‌} (exact)
Chained arrow notation \(10\rightarrow10\rightarrow2\,700\) (exact)
Hyper-E notation EE2700
Slow-growing hierarchy \(g_{\omega^{\omega^{\omega^32+\omega^27} } }(10)\)

Sources[]

  1. BlankEntity's Googology (Retrieved 10 June, 2022)
  2. Conway and Guy (1995) "The book of Numbers" Copernicus
  3. Fish Illion name of 10^10^x in Conway-Wechsler system 2021-12-25
  4. Fish Conway's illion converter - 10^10^2700

Class 0: Void Drive · Voidend · Void Fire · Void Onionmine · Voidmine · Alphillion · Betillion · Gammillion · Deltillion · Epsillion · Zetillion · Etillion · Thetillion · Atokyllion · (Void · Void Super) Photillion · Iotillion · Kappillion · Glillion · (H-) Bosillion WZ · (Void · Void Super) Higgsbillion · Electrillion · Positillion · Muillion · Taillion · Qu-Killion · Di-Gammillion · (Void · Void Super) Axillion · Curvatillion · Dilatillion · Lambdillion · (Du-) Gravitillion · Graviphotillion · (Void) Inflatillion · Lept-Qu-Killion · Majoronillion · Preonillion · Tachyillion · Bosillion XY · Skyrillion · Glubillion · Themesillion · Temesillion · Nuillion · Protillion · Neutrillion · (Lam- · Sig- · Xi- · Om-) Del-Barillion · Pillion · Xillion · Rhomesillion · (Weak) Etamesillion · Atyllion · (Psi- · Om- · Killi- · Bari-) Phi-Mesillion · Strong Epsimesillion · Demesillion · Qu-Killi-Mesillion · Qu-Tetrakillion · Qu-Pentakillion · (Exo- · Strong) Atillion · Anyillion · Davy-Solillion · Dropetillion · Excitillion · Fractillion · Magnillion · Phonillion · Plasmarillion · Plasmillion · Polaritillion · Polarillion · Rotillion · Triollion
Class 1: Hydrillion · Grassy · Unusual · Blank Googol · Piektā vienība · Jói sá fjórði · Kogol · Linear · Koogol · Unreasonable · Gum · Hyper fixation Number · Księżycowa noc dwóch tysięcy ósmej · Retrillion · Circular Trinity · Nieumarły kwiat w cyrku · Nieskończona pętla...użądlenia (lenistwo) · Viewed · Nogol · Aopz pz aol luk, pzu'a pa? · Noogol
Class 2: Killer · Wściekłość · Ruin · Krwawa podłoga...pięciu (samobójcze) · Left · Tangerine · Czerwony sznur losu · Egg · Pustka · Double-Yolk Egg · Nogil · Noogil · Chciwość · Beryllion · Zdradzony · Joogol · Pokonać · Poświęcenie · Jookol · 𒆙𒆴𒅃 · Onion · Opuszczone liceum · Zniszczenie · Grupa ludzi · Fluorillion · Cloudy, Cyrcööl · Neonillion · Sodillion · Mangesillion · Dies pluvia · Phosphillion · Doocol · Ethereal Epsimesillion · Koniec największego czasu · Argonillion · Antineutrillion · Antiprotillion · Voogol · Starfruit · Troogol · Blag · Megalogoogol · Qroogol · Chromillion · Quuquil · Seegil · Bromillion · Septul · Kryptillion · Octoogogol · Nonoogogol · Rubidillion · Ceegol · Y-Billion · Strontillion · Dragonfruit · Cobalt Googol · Arch · Azure Googol · Y-Trillion · Niobillion · Twintillion · Molybillion · Sapphire Googol · Ceedol · Emerald Googol · Amethyst Googol · Diamond Googol · Crimson Googol · Ruby Googol · Platinum Googol · Tangerine Googol · BeatGoogol · Golden Googol · Pure Googol · Ceetol · Glag / Antitaillion · Antimuillion · Technetillion · Rhodillion · Pineapple · Septenary-millillion · Xenillion · Cerillion · Ceedool · Onionmine · Apple · Praseodymillion · Tomato · Neodymillion · Notorious · Terbillion · End Googol · Dysprosbillion · Erbillion · Arkh · Bizzare Patch · Jebaition · Grapes · Y-Terbillion
Class 3: Noogolplex · Dusk Killer · Strawberry · Hafnillion · Hard boiled Egg · Dragon Egg · Rhenillion · Osmillion · Storm of O tromerós pólemos · Twitchillion · Onionillion · Platillion · Radmillion · Actinillion · Kai Radmillion · Bazillion · Protactinillion · Curimillion · Berkelbillion · Fermillion · Super Gravitillion · Mandelevi Millillion · Nobel-Billion · Terrible Technetillion · Super Axillion · Seasonal · Rutherfillion · Dubnillion · Xeno-Xenillion · Super Higgsbillion · Seaborgillion · Bohric Billion · Praseodymillion PLATINUM · Super Glillion · Terrific Terbillion · Diabolical Dysprosbillion
Class 4 to tetrational arrays (10101,000,000 ~ \(f_{\varepsilon_0}^2(10)\)): Super Photillion · Roentgenic Great Billion · Copernic Great Million · Astronomical Phosphophylphosphillion · Rose Radmillion · Kappa Twitchillion · Xeno-Xenillion Ultra · Flerovic Trillion · Mother's Invasive Circuitry · Livermorbillion · Tenessillion · Googology Onion · Ancient Temple of pusta jednostka · Platonic Praseodymillion PLATINUM · Irritable Drag · Infernal Googol · Blig · Yttrillion · Yubillion · Yuttrillion · Googologol · Omicrillion · Ybbutrillion · Poloceryllion · Dardstundtibillion · Thantatitanillion · Exotic Protein · Telthorunstillion · Eurancimerillion · Livid Idiosyncraticism · Darkmatter Million · Silvscovoldassillion · Octagnillion · Ye Olde Mauvillion · King Diamond Googol · Stellar Million · King Golden Googol · Infernal Googol · Oblivion Weave · Hyper Million · Berzillion · Spookbillion · Wubillion · Spookdecillion · Spookbarillion · Gargantuan Million · Extrillion · Atomic Atillion · Blööščillion · Vivillion · Beans · Byzantrillion · Burger · Umbcolbillion · Kolmas kenttä tyhjä · Box of Onions · Hojność · Mauvillion · Blaag · Bleg · Bilg · Blog · Blaaag · Void Stand · Greater Nobel-Billion · Sneesnillion · Vivivivillion · BLT · Blahg · Cavern of Pulykák · Grilled Onion · Heliotrillion · Argentum magnum secundum speedster · Disaster · Golden Egg · Horrible Execution · Diamond Egg · Onion-infused BEEF · The Egg of The Great King · Blast · Bccccscsc...szszszillion · L.E.E.T · Stardust Compactor · Onion-infused Multidimensional BEEF
Beyond tetrational arrays (\(>f_{\varepsilon_0}^2(10)\)): Treegol · Factoree · Fresh Xeno-Nobel-Multidimensional Stardust Onion from the future · Egg Salad · Okyeapu sehh ajz okkj: Wjz ok sehh iu heba, araj okkjan (Zqa pk sknoajejc yenyqiopwjyao)
Ill-defined: Dark Xillion · Dark Photillion · Xoogol · Hyper-chaotic Dragon-star Onion-Layered Multidimensional Compact BEEF patties of the next generation · Okyeapu sehh ajz okkj: Wjz ok sehh iu heba, araj okkjan

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