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A treseptuagintillion is equal to 10222 in America, or 10438 in France and Germany.[1]

In the long scale which is commonly used in France and Germany, 10222 is called septentrigintillion.

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{222}$$
Arrow notation $$10\uparrow222$$
Steinhaus-Moser Notation 108[3] 109[3]
Copy notation 9[222] 1[223]
Taro's multivariable Ackermann function A(3,734) A(3,735)
Pound-Star Notation #*((21))*10 #*((22))*10
BEAF {10,222}
Hyper-E notation E222
Bashicu matrix system (0)(0)(0)(0)(0)(0)[2942] (0)(0)(0)(0)(0)(0)[2943]
Hyperfactorial array notation 131! 132!
Fast-growing hierarchy $$f_2(727)$$ $$f_2(728)$$
Hardy hierarchy $$H_{\omega^2}(727)$$ $$H_{\omega^2}(728)$$
Slow-growing hierarchy $$g_{\omega^{\omega^22+\omega2+2}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{438}$$
Arrow notation $$10\uparrow438$$
Steinhaus-Moser Notation 191[3] 192[3]
Copy notation 9[438] 1[439]
Taro's multivariable Ackermann function A(3,1452) A(3,1453)
Pound-Star Notation #*((207))*13 #*((208))*13
BEAF {10,438}
Hyper-E notation E438
Bashicu matrix system (0)(0)(0)(0)(0)(0)(0)[2641] (0)(0)(0)(0)(0)(0)(0)[2642]
Hyperfactorial array notation 227! 228!
Fast-growing hierarchy $$f_2(1444)$$ $$f_2(1445)$$
Hardy hierarchy $$H_{\omega^2}(1444)$$ $$H_{\omega^2}(1445)$$
Slow-growing hierarchy $$g_{\omega^{\omega^24+\omega3+8}}(10)$$

## List of prefixed numbers derived from septuagintillion

Name Short scale Long scale
unseptuagintillion 10216 10426
duoseptuagintillion 10219 10432
treseptuagintillion 10222 10438
quattuorseptuagintillion 10225 10444
quinseptuagintillion 10228 10450
sexseptuagintillion 10231 10456
septenseptuagintillion 10234 10462
octoseptuagintillion 10237 10468
novemseptuagintillion 10240 10474

## Sources

1. Very big numbers on Skynet