The byllion is equal to \(10^{16}\) in the myriad system[1][2][3], or 10 squared 4 times. It is equal to 10 quadrillion in the short scale and 10 billiard in the long scale.

Its full decimal expansion is 10,000,000,000,000,000.

It is also called Jing (京 in Chinese) or Kei (けい in Japanese) in both Japanese counting system and Chinese counting system.[4]

Aarex Tiaokhiao calls this number sxdoocol or 16-noogol.[5]

10 Quadrillion Dollars

A Byllion dollars in 25 piles of 100 dollar bills, in comparison to the Empire State Building

As a banknote denomination

Only the Hungarian pengő had banknotes with this number in the denomination.


Notation Lower bound Upper bound
Scientific notation \(1\times10^{16}\)
Arrow notation \(10\uparrow16\)
Steinhaus-Moser Notation 13[3] 14[3]
Copy notation 9[16] 1[17]
Taro's multivariable Ackermann function A(3,50) A(3,51)
Pound-Star Notation #*(2,4,4)*5 #*(5)*21
BEAF {10,16}
Hyper-E notation E16
Bashicu matrix system (0)(0)[10000]
Hyperfactorial array notation 18! 19!
Fast-growing hierarchy \(f_2(47)\) \(f_2(48)\)
Hardy hierarchy \(H_{\omega^2}(47)\) \(H_{\omega^2}(48)\)
Slow-growing hierarchy \(g_{\omega^{\omega+6}}(10)\)


  1. Myriad system on Wikipedia
  2. Large numbers By Robert Munafo
  3. Short list of Myriad system
  4. 大数の名前
  5. Part 1 (LAN) - Aarex Googology

See also

myllion byllion tryllion quadryllion quintyllion
sextyllion septyllion octyllion nonyllion decyllion
undecyllion duodecyllion tredecyllion quattuordecyllion quindecyllion
sexdecyllion septdecyllion octodecyllion novemdecyllion vigintyllion
unvigintyllion duovigintyllion trevigintyllion quattuorvigintyllion quinvigintyllion
sexvigintyllion septemvigintyllion octovigintyllion novemvigintyllion trigintyllion
untrigintyllion duotrigintyllion tretrigintyllion quattuortrigintyllion quintrigintyllion
sextrigintyllion septtrigintyllion octotrigintyllion novemtrigintyllion quadragintyllion
quinquagintyllion sexagintyllion septuagintyllion octogintyllion nonagintyllion
centyllion ducentyllion trecentyllion quadringentyllion quingentyllion
sescentyllion septingentyllion octingentyllion nongentyllion millyllion
myryllion micryllion nanyllion picyllion femtyllion
attyllion zeptyllion yoctyllion googolyllion latinlatinlatinbyllionyllionyllionyllion
Googology in Asia

Fish numbers: Fish number 1 · Fish number 2 · Fish number 3 · Fish number 4 · Fish number 5 · Fish number 6 · Fish number 7
Mapping functions: S map · SS map · S(n) map · M(n) map · M(m,n) map
By Aeton: Okojo numbers · N-growing hierarchy
By BashicuHyudora: Primitive sequence number · Pair sequence number · Bashicu matrix system
By 巨大数大好きbot: Flan numbers
By Jason: Irrational arrow notation · δOCF · δφ
By mrna: SSAN · S-σ
By Nayuta Ito: N primitive
By Yukito: Hyper primitive sequence system · Y sequence · Y function
Indian counting system: Lakh · Crore · Uppala
Chinese, Japanese and Korean counting system: Wan · Yi · Zhao · Jing · Gai · Zi · Rang · Gou · Jian · Zheng · Zai · Ji · Gougasha · Asougi · Nayuta · Fukashigi · Muryoutaisuu
Buddhist text: Tallakshana · Dvajagravati · Mahakathana · Asankhyeya · Dvajagranisamani · Vahanaprajnapti · Inga · Kuruta · Sarvanikshepa · Agrasara · Uttaraparamanurajahpravesa · Avatamsaka Sutra · Nirabhilapya nirabhilapya parivarta
Other: Taro's multivariable Ackermann function · TR function · Sushi Kokuu Hen

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