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A maximusbillion (also known as billionplex[1] or billiplexion[2]) is equal to $$10^{10^9}$$, or one followed by a billion zeros using the short scale definition of a billion.[3] It is the 10,000,000th power of a googol, the 10,000th power of a googolgong, and the 1,000th power of a maximusmillion. It is 1,000,000,001 digits long.

Using the fuga- prefix this number can be called "fugaten".[4]

Username5243 calls this number goonvolplex, and it's equal to 10[1]10[1]9 in Username5243's Array Notation.[5]

Writing down the full decimal expansion would take 1000 books of 400 pages each, with 2,500 digits on each page.

## Names in -illion systems

In Conway-Wechsler system,[6] $$10^{10^{9}}$$ is expressed as ten N-th zillion with N=333333332 because $$10^{10^{9}} = 10 \cdot 10^{3N+3}$$, and therefore by using Fish's program,[7] short-scale name of $$10^{10^{9}}$$ for Conway-Wechsler system is determined as

ten trestrigintatrecentillitrestrigintatrecentilliduotrigintatrecentillion

According to Landon Curt Noll's The English name of a number, maximusbillion is also known as:

ten trecentretriginmilliamilliatrecentretriginmilliatrecenduotrigintillion

## Approximations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{1\,000\,000\,000}$$ (exact)
Arrow notation $$10\uparrow10\uparrow9$$ (exact)
Steinhaus-Moser Notation 8[3][3] 9[3][3]
Copy notation 9[3,2] 1[1[10]]
Taro's multivariable Ackermann function A(3,A(3,28)) A(3,A(3,29))
Pound-Star Notation #*((1))*10904 #*((1))*10905
BEAF {10,{10,9}}
Hyper-E notation E9#2
Bashicu matrix system (0)(1)[5] (0)(1)[6]
Hyperfactorial array notation (11!)! (12!)!
Fast-growing hierarchy $$f_2(f_2(26))$$ $$f_2(f_2(27))$$
Hardy hierarchy $$H_{\omega^22}(26)$$ $$H_{\omega^22}(27)$$
Slow-growing hierarchy $$g_{\omega^{\omega^9}}(10)$$

## Sources

-minutia group
n-ary numbers with multipliers
Eyelash mite group: eyelash mite-speck · eyelash mite-crumb · eyelash mite-chunk · (binary/ternary/octal)eyelash mite · eyelash mite-bunch · eyelash mite-crowd · eyelash mite-swarm
Dust mite group: dust mite-speck · dust mite-crumb · dust mite-chunk · (binary/ternary/octal)dust mite · dust mite-bunch · dust mite-crowd · dust mite-swarm
Cheese mite group: cheese mite-speck · cheese mite-crumb · cheese mite-chunk · (binary/ternary/octal)cheese mite · cheese mite-bunch · cheese mite-crowd · cheese mite-swarm
Clover mite group: clover mite-speck · clover mite-crumb · clover mite-chunk · (binary/ternary/octal)clover mite · clover mite-bunch · clover mite-crowd · clover mite-swarm
Pipsqueak group: (binary/ternary/octal)pipsqueak
Little squeaker group: (binary/ternary/octal)little squeaker
Small fry group: (binary/ternary/octal)small fry
Guppy group: (binary/ternary/octal)guppyspeck · (binary/ternary/octal)guppycrumb · (binary/ternary/octal)guppychunk · (ternary/quaternary/quinary/duodecimal/hexadecimal/vigesimal/sexagesimal)guppy(bit/byte)
Minnow group: (binary/ternary/octal)minnowspeck · (binary/ternary/octal)minnowcrumb · (binary/ternary/octal)minnowchunk · (ternary)minnow(bit/byte)
Goby group: (binary/ternary/octal)gobyspeck · (binary/ternary/octal)gobycrumb · (binary/ternary/octal)gobychunk · (ternary)goby(bit/byte)
Jumbo shrimp group: (binary/ternary/octal)jumbo shrimp
Lightweight group: (binary/ternary/octal)lightweight
Ogol group: (binary/ternary/octal)ogolspeck · (binary/ternary/octal)ogolcrumb · (binary/ternary/octal)ogolchunk · (ternary/quaternary/quinary/duodecimal/hexadecimal/vigesimal/sexagesimal)ogol(bit/byte)
Tiny twerpuloid group: (binary/ternary/octal)tiny twerpuloid
Googol group: (binary/ternary/octal)googolspeck · (binary/ternary/octal)googolcrumb · (binary/ternary/octal)googolchunk · (ternary/quaternary/quinary/duodecimal/hexadecimal/vigesimal/sexagesimal)googol*(bit/byte) · googolbunch · googolcrowd · googolswarm
Eceton group: ecetonspeck · ecetoncrumb · ecetonchunk · ecetonbunch · ecetoncrowd · ecetonswarm
*Not Saibian's
Numbers with base-multipliers
Numbers with -plex

Gar-: garone · gartwo · garthree · garfour · garfive · garsix · garseven · gareight · garnine · garten · garhundred · gargoogol · gartrialogue · gargoogolplex · gargiggol
Fz-: fzone · fztwo · fzthree · fzfour · fzfive · fzsix · fzseven · fzeight · fznine · fzten · fztwenty · fzhundred · fzthousand · fzmillion · fzgoogol · fzmilliplexion · fzgoogolplex · fzgargoogolplex · fzgargantugoogolplex · fzgiggol
Fuga-: fugaone · fugatwo · fugathree · fugafour · fugafive · fugasix · fugaseven · fugaeight · fuganine · fugaten · fugaeleven · fugahundred · fugagoogol · fugagoogolplex · fugagargoogolplex · fugagargantugoogolplex · fugagiggol
Megafuga-: megafugaone · megafugatwo · megafugathree · megafugafour · megafugafive · megafugasix · megafugaseven · megafugaeight · megafuganine · megafugaten · megafugaeleven · megafugatwelve · megafugathirteen · megafugafourteen · megafugafifteen · megafugasixteen · megafugaseventeen · megafugaeighteen · megafuganineteen · megafugatwenty · megafugathirty · megafugaforty · megafugafifty · megafugasixty · megafugaseventy · megafugaeighty · megafuganinety · megafugahundred · megafugagoogol · megafugagoogolplex · megafugagargoogolplex · megafugagargantugoogolplex
Booga-: boogaone · boogatwo · boogathree · boogafour · boogafive · boogasix · boogaten boogahundred · boogagoogol · boogagoogolplex
Gag: gagone · gagtwo · gagthree · gagfour · gagfive · gagsix · gagseven · gageight · gagnine · gagten · gaggoogol · gaggoogolplex