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Fugafive is equal to 554, or $$5 \downarrow \downarrow 5$$ using down-arrow notation. The name is formed by applying the fuga- prefix to 5. It has exactly 437 digits, meaning that it's larger than a centillion but smaller than a googolding.

The decimal expansion of fugafive is:

71821208748307350806616247734800247443646340206560432071396707807743664171107442303767251899701806274179648528361693395908493607789072590515205376005217038518864343357974324172025963219925969594574290850486833464941042717610929437440253086127413158881119110878565254870714807127305501250316534243564700489124592870454956410729577301690317708800960633255792684347901301624401393481617554653310899100138176009977541980333626270294189453125

## Approximations

Notation Lower bound Upper bound
Scientific notation $$7.182\times10^{436}$$ $$7.183\times10^{436}$$
Arrow notation $$5\uparrow625$$
Steinhaus-Moser Notation 191[3] 192[3]
Copy notation 6[437] 7[437]
Taro's multivariable Ackermann function A(3,1448) A(3,1449)
Pound-Star Notation #*((186))*13 #*((187))*13
BEAF {5,625}
Hyper-E notation E[5]4#2
Bashicu matrix system (0)(0)(0)(0)(0)(0)(0)[2587] (0)(0)(0)(0)(0)(0)(0)[2588]
Hyperfactorial array notation 226! 227!
Fast-growing hierarchy $$f_2(1\,440)$$ $$f_2(1\,441)$$
Hardy hierarchy $$H_{\omega^2}(1\,440)$$ $$H_{\omega^2}(1\,441)$$
Slow-growing hierarchy $$g_{\omega^{\omega^4}}(5)$$