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Duotrigintatrecentillion[1] or trecenti-triginti-deutillion[2] is equal to 10999 in short scale, and 101,992 in long scale.

In long scale, 10999 is called "sexsexagintacentilliard" (Saibian: centi-sexaginti-sextilliard), and in short scale, 101,992 is called "tresexagintasescentillion".

Duotrigintatrecentillion is also known as "trecenduotrigintillion" according to Landon Curt Noll's The English name of a number.

Its decimal expansion is:

1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{999}$$
Arrow notation $$10\uparrow999$$
Steinhaus-Moser Notation 386[3] 387[3]
Copy notation 9[999] 10[500]
Taro's multivariable Ackermann function A(3,3315) A(3,3316)
Pound-Star Notation #*((14))*19 #*((15))*19
H* function H(332)
BEAF {10,999}
Hyper-E notation E999
Bashicu matrix system (0)(1)[3] (0)(1)[4]
Hyperfactorial array notation 449! 450!
Fast-growing hierarchy $$f_2(3306)$$ $$f_2(3307)$$
Hardy hierarchy $$H_{\omega^2}(3306)$$ $$H_{\omega^2}(3307)$$
Slow-growing hierarchy $$g_{\omega^{\omega^29+\omega9+9}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{1992}$$
Arrow notation $$10\uparrow1992$$
Steinhaus-Moser Notation 700[3] 701[3]
Copy notation 9[1992] 1[1993]
Taro's multivariable Ackermann function A(3,6614) A(3,6615)
Pound-Star Notation #*((1993))*25 #*((1994))*25
BEAF {10,1992}
Hyper-E notation E1992
Bashicu matrix system (0)(1)[3] (0)(1)[4]
Hyperfactorial array notation 805! 806!
Fast-growing hierarchy $$f_2(6604)$$ $$f_2(6605)$$
Hardy hierarchy $$H_{\omega^2}(6604)$$ $$H_{\omega^2}(6605)$$
Slow-growing hierarchy $$g_{\omega^{\omega^3+\omega^29+\omega9+2}}(10)$$