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Epi-bitillion is equal to H(27) = H(128) = 10387, where H(x) = 103x+3.[1] It is also called octoviginticentillion in the short scale.[2] The term was coined by SuperJedi224. It is 388 digits long.

## Decimal expansion

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

## Approximations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{387}$$
Arrow notation $$10\uparrow387$$
Steinhaus-Moser Notation 172[3] 173[3]
Copy notation 9[387] 10[194]
Chained arrow notation $$10→387$$
Taro's multivariable Ackermann function A(3,1282) A(3,1283)
Pound-Star Notation #*((1904))*12 #*((1905))*12
BEAF {10,387}
Hyper-E notation E387
Bashicu matrix system (0)(0)(0)(0)(0)(0)(0)[1055] (0)(0)(0)(0)(0)(0)(0)[1056]
Bird's array notation {10,387}
Hyperfactorial array notation 205! 206!
Strong array notation s(10,387)
Fast-growing hierarchy $$f_2(1\,275)$$ $$f_2(1\,276)$$
Hardy hierarchy $$H_{\omega^2}(1\,275)$$ $$H_{\omega^2}(1\,276)$$
Slow-growing hierarchy $$g_{\omega^{\omega^23+\omega8+7}}(10)$$

## Sources

Numbers By SuperJedi224

Fibonacci Numbers

Level One

Level Two

#*

#**

H#*

#*{}

#*<<>>

H#*<<>>

Bingol series

Based on the Faxul

Other factorials

Googovipleccix family

Graham Sequence Numbers

-Illion numbers

Level One

Level Three

Level Four

"-Illion" numbers by SuperJedi224

Level One

Level Three

Level Four