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An octillion is equal to 1027 in America, or 1048 in France and Germany.[1]

In the long scale, 1027 is called quadrilliard, which is commonly used in France and Germany.

Both Russ Rowlett's Greek-based naming system[2] and Aarex Tiaokhiao's googology site[3] give the name ennillion for this number.

The number (in short scale) is also called tre-bitillion by SuperJedi224.[4]

It is 28 digits long in short scale, and 49 digits long in long scale.

## Decimal

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

## Examples

• The earth has a mass of about 5.98 octillion grams.
• The mass of the sun is about 1.989 octillion metric tons.
• The volume of the sun is about 1.412 octillion cubic meters.[5]
• An octillion dollars in 100 dollar bills would cover the US with a layer of 1000 km (625 miles) thick.
• A square of one octillion square centimeters in area would fit entirely inside the orbit of Mars (the diagonal of such a square would be about 2% smaller than the minor axis of its orbit).
• There are over 7 octillion atoms in the human body.
• There is over 169.5 octillion ways to play the first ten moves in chess.[6]
• The Hungarian pengő had the highest rate of hyperinflation recorded, reaching 400 octilion pengős.

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{27}$$
Arrow notation $$10\uparrow27$$
Steinhaus-Moser Notation 20[3] 21[3]
Copy notation 9[27] 10[14]
Taro's multivariable Ackermann function A(3,86) A(3,87)
Pound-Star Notation #*(2,8)*12 #*(0,0,2,2)*6
BEAF {10,27}
Hyper-E notation E27
Bashicu matrix system (0)(0)(0)[2371] (0)(0)(0)[2372]
Hyperfactorial array notation 26! 27!
Fast-growing hierarchy $$f_2(83)$$ $$f_2(84)$$
Hardy hierarchy $$H_{\omega^2}(83)$$ $$H_{\omega^2}(84)$$
Slow-growing hierarchy $$g_{\omega^{\omega2+7}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{48}$$
Arrow notation $$10\uparrow48$$
Steinhaus-Moser Notation 31[3] 32[3]
Copy notation 9[48] 1[49]
Taro's multivariable Ackermann function A(3,156) A(3,157)
Pound-Star Notation #*(6,3,6,4,3)*7 #*(7,3,6,4,3)*7
BEAF {10,48}
Hyper-E notation E48
Bashicu matrix system (0)(0)(0)(0)[1000]
Hyperfactorial array notation 40! 41!
Fast-growing hierarchy $$f_2(152)$$ $$f_2(153)$$
Hardy hierarchy $$H_{\omega^2}(152)$$ $$H_{\omega^2}(153)$$
Slow-growing hierarchy $$g_{\omega^{\omega4+8}}(10)$$

## Sources

1. Octillion at Wolfram MathWorld
2. Names for Large Numbers
3. Aarex Tiaokhiao's illion numbers
4. https://sites.google.com/site/sjpgoogol/illions
5. Saibian, Sbiis. Even Larger Numbers In Science and Astronomy. Retrieved 2015-01-24.