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A sexdecillion or octilliard[1] is equal to 1051 in America, or 1096 in France and Germany.[2]

In the long scale, 1051 is called octilliard, which is commonly used in France and Germany.

This number is also called heptadekillion in Russ Rowlett's Greek-based naming system.[3]

## Decimal

• 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 - short scale
• 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000000,000,000,000,000,000,000,000 - long scale

## Examples

• The volume of the milky way galaxy is about a sexdecillion cubic miles.[4]
• The prefix tenazetta- multiplies by one sexdecillion.

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{51}$$
Arrow notation $$10\uparrow51$$
Steinhaus-Moser Notation 33[3] 34[3]
Copy notation 9[51] 10[26]
Taro's multivariable Ackermann function A(3,166) A(3,167)
Pound-Star Notation #*(9,6,2,6,0,1)*6 #*(11,6,11)*13
BEAF {10,51}
Hyper-E notation E51
Bashicu matrix system (0)(0)(0)(0)[1539] (0)(0)(0)(0)[1540]
Hyperfactorial array notation 41! 42!
Fast-growing hierarchy $$f_2(162)$$ $$f_2(163)$$
Hardy hierarchy $$H_{\omega^2}(162)$$ $$H_{\omega^2}(163)$$
Slow-growing hierarchy $$g_{\omega^{\omega5+1}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{96}$$
Arrow notation $$10\uparrow96$$
Steinhaus-Moser Notation 55[3] 56[3]
Copy notation 9[96] 1[97]
Taro's multivariable Ackermann function A(3,315) A(3,316)
Pound-Star Notation #*(2,11,1,3,7,8)*10 #*(7,9,4,3,5,6,4)*8
BEAF {10,96}
Hyper-E notation E96
Bashicu matrix system (0)(0)(0)(0)(0)[1000]
Hyperfactorial array notation 67! 68!
Fast-growing hierarchy $$f_2(310)$$ $$f_2(311)$$
Hardy hierarchy $$H_{\omega^2}(310)$$ $$H_{\omega^2}(311)$$
Slow-growing hierarchy $$g_{\omega^{\omega9+6}}(10)$$

## List of prefixed numbers derived from decillion

Name Short scale Long scale
undecillion 1036 1066
duodecillion 1039 1072
tredecillion 1042 1078
quattuordecillion 1045 1084
quindecillion 1048 1090
sexdecillion 1051 1096
septendecillion 1054 10102
octodecillion 1057 10108
novemdecillion 1060 10114