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An octoquinquagintillion is equal to 10177 in America, or 10348 in France and Germany by Conway-Wechsler system.[1][2][3][4][5]

In the long scale which is commonly used in France and Germany, 10177 is called novemvigintilliard.

According to calculations by Ashton, it costs 4 octoquinquagintallion to buy a ticket to mars in the video game AdVenture Capitalist.

## Decimal expansion

In short scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

In long scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{177}$$
Arrow notation $$10\uparrow177$$
Steinhaus-Moser Notation 90[3] 91[3]
Copy notation 9[177] 10[89]
Taro's multivariable Ackermann function A(3,584) A(3,585)
Pound-Star Notation #*((37))*9 #*((38))*9
BEAF {10,177}
Hyper-E notation E177
Bashicu matrix system (0)(0)(0)(0)(0)(0)[582] (0)(0)(0)(0)(0)(0)[583]
Hyperfactorial array notation 109! 110!
Fast-growing hierarchy $$f_2(578)$$ $$f_2(579)$$
Hardy hierarchy $$H_{\omega^2}(578)$$ $$H_{\omega^2}(579)$$
Slow-growing hierarchy $$g_{\omega^{\omega^2+\omega7+7}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{348}$$
Arrow notation $$10\uparrow348$$
Steinhaus-Moser Notation 158[3] 159[3]
Copy notation 9[348] 1[349]
Taro's multivariable Ackermann function A(3,1153) A(3,1154)
Pound-Star Notation #*((38))*12 #*((39))*12
BEAF {10,348}
Hyper-E notation E348
Bashicu matrix system (0)(0)(0)(0)(0)(0)(0)[523] (0)(0)(0)(0)(0)(0)(0)[524]
Hyperfactorial array notation 188! 189!
Fast-growing hierarchy $$f_2(1\,145)$$ $$f_2(1\,146)$$
Hardy hierarchy $$H_{\omega^2}(1\,145)$$ $$H_{\omega^2}(1\,146)$$
Slow-growing hierarchy $$g_{\omega^{\omega^23+\omega4+8}}(10)$$

## 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