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One tremilliamilliamilliatrecentretriginmilliamilliatrecentretriginmilliatrecendotrigintillion is $$10^{9,999,999,999}$$ = $$10^{10^{10}-1}$$,[1] according to a system created by Landon Curt Noll.[2] It is equal to 1019,999,999,992 in the long scale. This number is slightly close to a trialogue.

## Approximations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{9\,999\,999\,999}$$
Arrow notation $$10\uparrow9\,999\,999\,999$$
Down-arrow notation $$253\downarrow\downarrow5$$ $$10\downarrow\downarrow11$$
Steinhaus-Moser Notation 9[3][3] 10[3][3]
Copy notation 9[9[10]] 1[1[11]]
Chained arrow notation $$10→9\,999\,999\,999$$
H* function H(3H(2)) H(4H(2))
Taro's multivariable Ackermann function A(3,A(3,31)) A(3,A(3,32))
Pound-Star Notation #*((1))*32679 #*((1))*32680
BEAF {10,9999999999}
Hyper-E notation E9,999,999,999
Bashicu matrix system (0)(1)[5] (0)(1)[6]
Hyperfactorial array notation (12!)! (13!)!
Fast-growing hierarchy $$f_2(f_2(30))$$ $$f_2(f_2(31))$$
Hardy hierarchy $$H_{\omega^22}(30)$$ $$H_{\omega^22}(31)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{9}9+\omega^{8}9}}(10)$$ $$g_{\omega^{\omega^\omega}}(10)$$

## Sources

1. The English name of a number: Set "Power of 10," "English name," "American system," "milliamillia...," "without any -'s," enter 9999999999 into the box, and press "Name that number."
2. How high can you count?