Byllion

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Not to be confused with Billion.

Byllion is equal to \(10^{16}\) in the -yllion system by Donald Knuth^[1]^[2]^[3]^[4], 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 (京 in Japanese) in both Japanese counting system and Chinese counting system.^[5]

Aarex Tiaokhiao calls this number sxdoocol or 16-noogol.^[6]

CompactStar gave the name tetryriad for this number as part of the -yriad system, referring to it being myriad⁴.^[7]

This number is the unit of the second order in the sand reckoner system because it is the result of (10⁸)² ^[8]

DeepLineMadom calls the number troo-exdecol, and is equal to 10[3]16 in DeepLineMadom's Array Notation.^[9]

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.

Approximations[]

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	\(g_{\omega^{\omega+6}}(10), g_{\omega^{2}}^{4}(10)\)