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A milli-millillion[1] or micrillion[2] is equal to 103,000,003 in the short scale, or 106,000,000 in the long scale.

The word milli-millillion was coined by Professor Henkle in his system to devise one million -illions[3], and milli-millillion was the largest name in that system.

The name micrillion was coined by Jonathan Bowers. It comes from micr(o)- + -illion, where micro- is analogous to the metric prefixes deci-, centi-, and milli-.

It is pronounced as follows:

## Approximations

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{3\,000\,003}$$
Arrow notation $$10\uparrow3\,000\,003$$
Steinhaus-Moser Notation 6[3][3] 7[3][3]
Copy notation 2[2[7]] 3[3[7]]
Chained arrow notation $$10→3\,000\,003$$
Taro's multivariable Ackermann function A(3,A(3,20)) A(3,A(3,21))
Pound-Star Notation #*((1660893))*705 #*((1660894))*705
BEAF {10,3000003}
Hyper-E notation E3,000,003
Bashicu matrix system (0)(1)[20] (0)(1)[21]
Hyperfactorial array notation (9!)! (10!)!
Fast-growing hierarchy $$f_2(f_2(19))$$ $$f_2(f_2(20))$$
Hardy hierarchy $$H_{\omega^22}(19)$$ $$H_{\omega^22}(20)$$
Slow-growing hierarchy $$g_{\omega^{\omega^63+3}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{6\,000\,000}$$
Arrow notation $$10\uparrow6\,000\,000$$
Steinhaus-Moser Notation 1000000[3]
Copy notation 5[5[7]] 6[6[7]]
Taro's multivariable Ackermann function A(3,A(3,21)) A(3,A(3,22))
Pound-Star Notation #*((12278))*975 #*((12279))*975
BEAF {10,6000000}
Hyper-E notation E(6E6)
Bashicu matrix system (0)(1)[21] (0)(1)[22]
Hyperfactorial array notation (9!)! (10!)!
Fast-growing hierarchy $$f_2(f_2(19))$$ $$f_2(f_2(20))$$
Hardy hierarchy $$H_{\omega^22}(19)$$ $$H_{\omega^22}(20)$$
Slow-growing hierarchy $$g_{\omega^{\omega^66}}(10)$$