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A sesvigintillion or sevigintillion is equal to $$10^{81}$$ in the short scale, or $$10^{156}$$ in the long scale. Sesvigintillion is a name based on Conway and Guy's naming system,[1][2][3][4] and sexvigintillion is a name based on Russ Rowlett's naming system.[5]

In the long scale, $$10^{81}$$ is called tredecilliard, which is commonly used in France and Germany.

## Decimal

For short scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000

For long scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

## Approximations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{81}$$
Arrow notation $$10\uparrow81$$
Steinhaus-Moser Notation 48[3] 49[3]
Copy notation 9[81] 10[41]
Taro's multivariable Ackermann function A(3,266) A(3,267)
Pound-Star Notation #*(9,5,0,5,5,0,2)*7 #*(10,5,0,5,5,0,2)*7
BEAF {10,81}
Bashicu matrix system (0)(0)(0)(0)(0)[339] (0)(0)(0)(0)(0)[340]
Hyperfactorial array notation 59! 60!
Fast-growing hierarchy $$f_2(261)$$ $$f_2(262)$$
Hardy hierarchy $$H_{\omega^2}(261)$$ $$H_{\omega^2}(262)$$
Slow-growing hierarchy $$g_{\omega^{\omega8+1}}(10)$$

## List of prefixed numbers derived from vigintillion

Name Short scale Long scale
unvigintillion 1066 10126
duovigintillion 1069 10132
trevigintillion 1072 10138
quattuorvigintillion 1075 10144
quinvigintillion 1078 10150
sexvigintillion 1081 10156
septenvigintillion 1084 10162
octovigintillion 1087 10168
novemvigintillion 1090 10174

## Sources

1. Extensions to the -illions I: Henkle, Conway, and Rowlett
2. Conway and Guy. (1995) "The book of Numbers" Copernicus
3. The Conway-Wechsler System
4. Fish, Conway's zillion numbers, 2022/02/20.
5. Names for Large Numbers (Internet archive, archived at 6 June, 2002)

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