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.


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 \(g_{\omega^{\omega^{9}9+\omega^{8}9}}(10)\) \(g_{\omega^{\omega^\omega}}(10)\)


  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?

See also

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