Millillion

Not to be confused with Million.

A millillion (alternately millinillion, milliatillion or milletillion^[1]) is equal to 10^3,003 in the short scale, or 10^6,000 in the long scale.^[2] It is made by combining "mille" (1,000) with the standard -illion suffix, which is itself derived from "mille". Millillion has earned some popularity for its whimsical pronunciation along with its extension, milli-millillion.

Aarex Tiaokhiao gave the name mlastomillion to the value of this number.^[3]

André Joyce calls this number (in short scale) umpbarbar.^[4]

Written out in decimal form millillion (in the short scale) is:

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In long scale:

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Approximations

For short scale:

Notation	Lower bound	Upper bound
Scientific notation	\(1\times10^{3,003}\)
Arrow notation	\(10\uparrow3,003\)
Steinhaus-Moser Notation	1000[3]	1001[3]
Copy notation	9[3003]	10[1502]
Taro's multivariable Ackermann function	A(3,9972)	A(3,9973)
Pound-Star Notation	#((2685))30	#((2686))30
BEAF	\(\{10,3\,003\}\)
Hyper-E notation	E3,003
Bashicu matrix system	(0)(1)[3]	(0)(1)[4]
Hyperfactorial array notation	1,143!	1,144!
Fast-growing hierarchy	\(f_2(9\,962)\)	\(f_2(9\,963)\)
Hardy hierarchy	\(H_{\omega^2}(9\,962)\)	\(H_{\omega^2}(9\,963)\)
Slow-growing hierarchy	\(g_{\omega^{\omega^33+3}}(10)\)

For long scale:

Notation	Lower bound	Upper bound
Scientific notation	\(1\times10^{6,000}\)
Arrow notation	\(10\uparrow6,000\)
Steinhaus-Moser Notation	1838[3]	1839[3]
Copy notation	9[6000]	1[6001]
Taro's multivariable Ackermann function	A(3,19928)	A(3,19929)
Pound-Star Notation	#((1249))41	#((1250))41
BEAF	\(\{10,6\,000\}\)
Hyper-E notation	E6,000
Bashicu matrix system	(0)(1)[3]	(0)(1)[4]
Hyperfactorial array notation	2,079!	2,080!
Fast-growing hierarchy	\(f_2(19\,917)\)	\(f_2(19\,918)\)
Hardy hierarchy	\(H_{\omega^2}(19\,917)\)	\(H_{\omega^2}(19\,918)\)
Slow-growing hierarchy	\(g_{\omega^{\omega^36}}(10)\)