A quadrillion is equal to 1015 in the US and the United Kingdom, or 1024 in France and Germany.[1][2][3][4] The number is commonly abbreviated as Qa or q (one quadrillion would be 1Qa, not to be confused with Quintillion's abbreviation of Qi or Q)
1 quadrillion dollars in 5 piles of 100 dollar bills in comparison to the Empire State Building.
In the long scale, 1015 is called billiard (not to be confused with a game), which is commonly used in France and Germany.
Written out in decimal form quadrillion (in the short scale) is:
In long scale, it is:
Alternative names[]
Small fry gallons of water, compared with pipsqueak, little squeaker, and manhattan.[5]
This number is also called pentillion in Russ Rowlett's Greek-based naming system.[6]
Aarex Tiaokhiao gave the name petillion[7] and Sbiis Saibian gave the names small fry, guppycrumb, and minnowspeck,[5] referring to the short scale value of this number.
Wikia user NumLynx gave the name quintisand for this number's short scale value.[8]
Aarex Tiaokhiao also calls this number (in short scale) qndoocol or 15-noogol.[9]
BlankEntity calls this number Jookol.[10]
This number (in short scale) is known as a padma (पद्म) in the Indian numbering system.[11][12]
DeepLineMadom calls the number troo-pedecol, and is equal to 10[3]15 in DeepLineMadom's Array Notation.[13]
Approximations[]
For short scale:
| Notation | Lower bound | Upper bound |
|---|---|---|
| Scientific notation | \(1\times10^{15}\) | |
| Arrow notation | \(10\uparrow15\) | |
| Steinhaus-Moser Notation | 13[3] | 14[3] |
| Copy notation | 9[15] | 10[8] |
| Taro's multivariable Ackermann function | A(3,46) | A(3,47) |
| Pound-Star Notation | #*(2,2,3)*5 | #*(2,2,1)*6 |
| BEAF | {10,15} | |
| Bashicu matrix system | (0)(0)[5623] | (0)(0)[5624] |
| Hyperfactorial array notation | 17! | 18! |
| Fast-growing hierarchy | \(f_2(44)\) | \(f_2(45)\) |
| Hardy hierarchy | \(H_{\omega^2}(44)\) | \(H_{\omega^2}(45)\) |
| Slow-growing hierarchy | \(g_{\omega^{\omega+5}}(10)\) | |
For long scale:
| Notation | Lower bound | Upper bound |
|---|---|---|
| Scientific notation | \(1\times10^{24}\) | |
| Arrow notation | \(10\uparrow24\) | |
| Chained arrow notation | \(10\rightarrow24\) | |
| Steinhaus-Moser Notation | 18[3] | 19[3] |
| Copy notation | 9[24] | 1[25] |
| Taro's multivariable Ackermann function | A(3,76) | A(3,77) |
| Pound-Star Notation | #*(1,2,3,3)*5 | #*(2,2,3,3)*5 |
| BEAF | {10,24} | |
| Hyper-E notation | E24 | |
| Bashicu matrix system | (0)(0)(0)[1000] | |
| Hyperfactorial array notation | 24! | 25! |
| Bird's array notation | {10,24} | |
| Fast-growing hierarchy | \(f_2(73)\) | \(f_2(74)\) |
| Hardy hierarchy | \(H_{\omega^2}(73)\) | \(H_{\omega^2}(74)\) |
| Slow-growing hierarchy | \(g_{\omega^{\omega2+4}}(10)\) | |
Examples[]
- On the website of Niagara Falls State Park,[14] it is stated: “This accounts for 75,750 gallons of water per second over the American and Bridal Veil Falls and 681,750 gallons per second over the Horseshoe Falls.” This adds up to 757,500 gallons of water every second, or about 2.39 × 1013 gallons per year. At this rate, it would take roughly 42 years for 1 quadrillion gallons of water to flow over the falls.
- The Great Lakes have a volume of about 6 quadrillion gallons.[15]
- The universe is about 436 quadrillion seconds old.[16]
- It is about 586 quadrillion miles from one end of the Milky Way to the other.[17]
- The SI prefix peta- multiplies by one quadrillion.
- 1,000,000,000,000,000 to 10,000,000,000,000,000 (1015 to 1016) – The estimated total number of ants on Earth alive at any one time (their biomass is approximately equal to the total biomass of the human race).[citation needed]
- 9,007,199,254,740,992 (253) – number until which all integer values can exactly be represented in IEEE double precision floating-point format.
- 48,988,659,276,962,496 is the fifth taxicab number.[citation needed]
- In Isaac Asimov's Galactic Empire, in what we call 22,500 CE there are 25,000,000 different inhabited planets in the Galactic Empire, all inhabited by humans in Asimov's "human galaxy" scenario, each with an average population of 2,000,000,000, thus yielding a total Galactic Empire population of approximately 50,000,000,000,000,000.[citation needed]
- The average man creates about 13 quadrillion sperm cells in a lifetime.[citation needed]
- There are 256 = 7.205759×1016 different possible keys in the obsolete 56-bit DES symmetric cipher.
- Very few villains have killed quadrillions of people.[citation needed]
As a banknote denomination[]
Only the Hungarian pengő had banknotes with this number in the denomination.
Gallery[]
Sources[]
- ↑ Cambridge Dictionary Quadrillion
- ↑ Larousse (French dictionary) Quadrillion (source for long scale in French)
- ↑ Conway and Guy. The Book of Numbers. Copernicus. 1995. ISBN 978-0387979939 p.16
- ↑ Quadrillion at Wolfram MathWorld
- ↑ 5.0 5.1 Hyper-E Notation, Large Numbers
- ↑ Russ Rowlett Names for Large Numbers Archived 2006-01-10.
- ↑ Full list of my illion, Aarex Large Numbers[dead link]
- ↑ -sand numbers. Retrieved 2021-10-28.
- ↑ Part 1 (LAN) - Aarex Googology[dead link]
- ↑ BlankEntity's Googology Site
- ↑ Teachoo Indian and International System of Numeration
- ↑ अरब, खरब, नील, पद्म, शंख में कितने होते हैं शून्य? जानें भारतीय अंक प्रणाली (How many zeros are there in Arab, Kharab, Neel, Padma, and Shankh? Learn about the Indian numbering system.) in Hindi
- ↑ Pointless Googolplex Stuffs - DLMAN Part 1 (retrieved 9 November 2024)
- ↑ Niagara Falls State Park. Facts about Niagara Falls Retrieved 2025-09-22.
- ↑ Enviroliteracy Team. How Many Gallons of Water in the Great Lakes? 2024-09-09.
- ↑ Redefining the Universe Through Mathematics. The Universe Clock, The Age of the Universe In Seconds Retrieved 2025-09-22.
- ↑ Saibian, Sbiis. 2.1.4 - Everyday Large Numbers for a Modern World. Retrieved 2013-06-11.
See also[]
10–19: decillion · undec · duodec · tredec · quattuordec · quindec · sexdec · septendec · octodec · novemdec
20–29: vigintillion · unvigint · duovigint · tresvigint · quattuorvigint · quinvigint · sesvigint · septemvigint · octovigint · novemvigint
30–39: trigintillion (un- · duo- · tres- · quattuor- · quin- · ses- · septen- · octo- · noven-)
40–49: quadragintillion (un- · duo- · tres- · quattuor- · quin- · ses- · septen- · octo- · noven-)
50–59: quinquagintillion (un- · duo- · tres- · quattuor- · quin- · ses- · septen- · octo- · noven-)
60–69: sexagintillion (un- · duo- · tre- · quattuor- · quin- · se- · septen- · octo- · noven-)
70–79: septuagintillion (un- · duo- · tre- · quattuor- · quin- · se- · septen- · octo- · noven-)
80–89: octogintillion (un- · duo- · tres- · quattuor- · quin- · sex- · septem- · octo- · novem-)
90–99: nonagintillion (un- · duo- · tre- · quattuor- · quin- · se- · septe- · octo- · nove-)
100–900: centillion · ducent · trecent · quadringent · quingent · sescent · septingent · octingent · nongent
1,000–1030: millillion · dumill · dumillinonagintanongent · trimill · trimilliduotrigintatrecent · trimillisexoctogintaoctingent · quadrimill · quadrimilliquattuordecicent · quinmill · sexmill · septimill · octimill · nonimill · myr · decimilliquinsexagintasescent · dumyr · unquadragintamilliunquinquagintacent · centimill · micr · nan · pic · femt · att · zept · yoct · ront · quect
Indian counting system: Lakh · Crore · Padma · Tallakshana · Ogha · Ababa · Atata · Sogandhika · Uppala · Dvajagravati · Kumuda · Pundarika · Paduma · Kathana · Mahakathana · Asankhyeya · Dvajagranisamani · Vahanaprajnapti · Inga · Kuruta · Sarvanikshepa · Agrasara · Uttaraparamanurajahpravesa · Avatamsaka Sutra · Nirabhilapya nirabhilapya parivarta · Jaghanya Parīta Asaṃkhyāta
Chinese, Japanese and Korean counting system: Wan · Yi · Zhao · Jing · Gai · Zi · Rang · Gou · Jian · Zheng · Zai · Ji · Gougasha · Asougi · Nayuta · Fukashigi · Muryoutaisuu
See also: Template:Googology in Japan