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The octyllion is equal to $$10^{1,024}$$ in the myriad system[1][2], or 10 squared 10 times. It is 1,025 digits long. Nirvana Supermind calls this number unectol, and it's equal to $$r(10,1)$$ in Rampant Array Notation[3].

## Decimal expansion

10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

## Approximations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{1024}$$
Arrow notation $$10\uparrow1024$$
Steinhaus-Moser Notation 394[3] 395[3]
Copy notation 9[1024] 1[1025]
Taro's multivariable Ackermann function A(3,3398) A(3,3399)
Pound-Star Notation #*((70))*19 #*((71))*19
BEAF {10,1024}
Hyper-E notation E1,024
Bashicu matrix system (0)(1)[3] (0)(1)[4]
Hyperfactorial array notation 458! 459!
Fast-growing hierarchy $$f_2(3\,389)$$ $$f_2(3\,390)$$
Hardy hierarchy $$H_{\omega^2}(3\,389)$$ $$H_{\omega^2}(3\,390)$$
Slow-growing hierarchy $$g_{\omega^{\omega^3+\omega \times 2+4}}(10)$$