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Unquadragintamilliunquinquagintacentillion is equivalent to 10123,456 in the short scale and 10246,906 in the long scale[1]. The term was coined by Trakaplex under the name of Anonymous in a comment to a question "What is after a centillion?". The creator also calls it short scale the ascenhexillion due to the exponent ascending to the sixth counting digit, similarly seen in quadrimilliquattuordecicentillion for the fifth.

## Approximations

### Short scale

Notation Approximation
Scientific notation 1*10123,456 (exact)
BEAF {10,123456} (exact)
Steinhaus-Moser Notation 27782[3]
Hyper-E notation E123,456 (exact)
Fast-growing hierarchy $$f_2^2(15)$$
Hardy hierarchy $$H_{\omega^2 \times 2}(15)$$
Slow-growing hierarchy $$g_{\omega^{\omega^5+\omega^4 \times 2 + \omega^3} }(10)$$

### Long scale

Notation Lower bound Upper bound
Scientific notation 1*10^246906
Arrow notation 10 ↑ 246906
Chained arrow notation 10 → 246906
BEAF {10,246906)
Hyper-E notation E246906
Bird's array notation {10,246906}
Strong array notation s(10,246906)

## Sources

1. Anonymous, a comment to "What is after a centillion?" in Answers.com.