- Not to be confused with octahectillion.
Octehectillion is equal to \(10^{3\cdot10^{324} + 3}\).[1] It is defined using Sbiis Saibian's generalization of Jonathan Bowers' -illion system.
Approximations[]
| Notation | Lower bound | Upper bound |
|---|---|---|
| Arrow notation | \(1000\uparrow(1+10\uparrow324)\) | |
| Down-arrow notation | \(1000\downarrow\downarrow109\) | \(737\downarrow\downarrow114\) |
| Steinhaus-Moser Notation | 148[3][3] | 149[3][3] |
| Copy notation | 2[2[325]] | 3[3[325]] |
| H* function | H(H(107)) | |
| Taro's multivariable Ackermann function | A(3,A(3,1076)) | A(3,A(3,1077)) |
| Pound-Star Notation | #*((1))*((4))*9 | #*((1))*((5))*9 |
| BEAF | {1000,1+{10,324}} | |
| Hyper-E notation | E(3+3E324) | |
| Bashicu matrix system | (0)(1)[32] | (0)(1)[33] |
| Hyperfactorial array notation | (176!)! | (177!)! |
| Fast-growing hierarchy | \(f_2(f_2(1069))\) | \(f_2(f_2(1070))\) |
| Hardy hierarchy | \(H_{\omega^22}(1069)\) | \(H_{\omega^22}(1070)\) |
| Slow-growing hierarchy | \(g_{\omega^{\omega^{\omega^23+\omega2+4}3+3}}(10)\) | |