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A sexquinquagintillion or sesquinquagintillion is equal to 10171 in America, or 10336 in France and Germany by Conway-Wechsler system.[1][2][3][4][5] Sesquinquagintallion is an original name by Conway and sexquinquagintallion is a simplified name.

In the long scale which is commonly used in France and Germany, 10171 is called octovigintilliard.

## Decimal expansion

In short scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

In long scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{171}$$
Arrow notation $$10\uparrow171$$
Steinhaus-Moser Notation 87[3] 88[3]
Copy notation 9[171] 10[86]
Taro's multivariable Ackermann function A(3,565) A(3,566)
Pound-Star Notation #*((16))*9 #*((17))*9
BEAF {10,171}
Hyper-E notation E171
Bashicu matrix system (0)(0)(0)(0)(0)(0)[469] (0)(0)(0)(0)(0)(0)[470]
Hyperfactorial array notation 106! 107!
Fast-growing hierarchy $$f_2(558)$$ $$f_2(559)$$
Hardy hierarchy $$H_{\omega^2}(558)$$ $$H_{\omega^2}(559)$$
Slow-growing hierarchy $$g_{\omega^{\omega^2+\omega7+1}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{336}$$
Arrow notation $$10\uparrow336$$
Steinhaus-Moser Notation 153[3] 154[3]
Copy notation 9[336] 1[337]
Taro's multivariable Ackermann function A(3,1113) A(3,1114)
Pound-Star Notation #*((11))*12 #*((12))*12
BEAF {10,336}
Hyper-E notation E336
Bashicu matrix system (0)(0)(0)(0)(0)(0)(0)[421] (0)(0)(0)(0)(0)(0)(0)[422]
Hyperfactorial array notation 182! 183!
Fast-growing hierarchy $$f_2(1\,106)$$ $$f_2(1\,107)$$
Hardy hierarchy $$H_{\omega^2}(1\,106)$$ $$H_{\omega^2}(1\,107)$$
Slow-growing hierarchy $$g_{\omega^{\omega^23+\omega3+6}}(10)$$

## List of prefixed numbers derived from quinquagintillion

Name Short scale Long scale
unquinquagintillion 10156 10306
duoquinquagintillion 10159 10312
trequinquagintillion 10162 10318
quattuorquinquagintillion 10165 10324
quinquinquagintillion 10168 10330
sexquinquagintillion 10171 10336
septenquinquagintillion 10174 10342
octoquinquagintillion 10177 10348
novemquinquagintillion 10180 10354

## Sources

1. Conway and Guy. (1995) "The book of Numbers" Copernicus
2. Steve Olsen, Big-Ass Numbers
3. The Conway-Wechsler System
4. Extensions to the -illions I: Henkle, Conway, and Rowlett
5. Fish. Conway's zillion numbers, July 25, 2021