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A septenquadragintillion is equal to $$10^{144}$$ or $$10^{282}$$ in France and Germany by Conway-Wechsler system.[1][2][3][4][5]

In the long scale which is commonly used in France and Germany, $$10^{144}$$ is called quattuorvigintillion.

## Decimal expansion

In short scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

In long scale:

1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

## In metrology

It is also the largest unit conversion factor (namely, the number of cubic yoctometres in a cubic yottametre).

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{144}$$
Arrow notation $$10\uparrow144$$
Steinhaus-Moser Notation 76[3] 77[3]
Copy notation 9[144] 1[145]
Taro's multivariable Ackermann function A(3,475) A(3,476)
Pound-Star Notation #*(10,11,11,12,2,4,3,4)*10 #*(11,11,11,12,2,4,3,4)*10
BEAF {10,144}
Hyper-E notation E144
Bashicu matrix system (0)(0)(0)(0)(0)[31622] (0)(0)(0)(0)(0)[31623]
Hyperfactorial array notation 92! 93!
Fast-growing hierarchy $$f_2(469)$$ $$f_2(470)$$
Hardy hierarchy $$H_{\omega^2}(469)$$ $$H_{\omega^2}(470)$$
Slow-growing hierarchy $$g_{\omega^{\omega^2+\omega4+4}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{282}$$
Arrow notation $$10\uparrow282$$
Steinhaus-Moser Notation 132[3] 133[3]
Copy notation 9[282] 1[283]
Taro's multivariable Ackermann function A(3,933) A(3,934)
Pound-Star Notation #*((31))*11 #*((32))*11
BEAF {10,282}
Hyper-E notation E282
Bashicu matrix system (0)(0)(0)(0)(0)(0)[25482] (0)(0)(0)(0)(0)(0)[25483]
Hyperfactorial array notation 158! 159!
Fast-growing hierarchy $$f_2(926)$$ $$f_2(927)$$
Hardy hierarchy $$H_{\omega^2}(926)$$ $$H_{\omega^2}(927)$$
Slow-growing hierarchy $$g_{\omega^{\omega^22+\omega8+2}}(10)$$

## List of prefixed numbers derived from quadragintillion

Name Short scale Long scale