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The maximustrillion or trillionplex[1] or trilliplexion[2] is equal to $$10^{10^{12}}$$.[3] It is the 10,000,000,000th power of a googol, the 10,000,000th power of a googolgong, the 1,000,000th power of a maximusmillion and the 1000th power of a maximusbillion . It is 1,000,000,000,001 digits long.

The hypothetical inflationary universe is about a maximustrillion meters across, according to Alan Guth's inflationary model.[3]

Writing down the full decimal expansion would take 1,000,000 books of 400 pages each, with 2,500 digits on each page.

## Names in -illion systems

In the short scale, it is also called:

ten trestrigintatrecenmillitrestrigintatrecenmillitrestrigintatrecenmilliduotrigintatrecentillion

According to Landon Curt Noll's The English name of a number, maximustrillion is also known as:

ten trecentretriginmilliamilliamilliatrecentretriginmilliamilliatrecentretriginmilliatrecenduotrigintillion

## Approximations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{1\,000\,000\,000\,000}$$ (exact)
Arrow notation $$10\uparrow10\uparrow12$$ (exact)
Down-arrow notation $$10\downarrow\downarrow13$$ (exact)
Steinhaus-Moser Notation 10[3][3] 11[3][3]
Copy notation 9[9[12]] 1[1[13]]
H* function H(333H(2)) H(334H(2))
Taro's multivariable Ackermann function A(3,A(3,38)) A(3,A(3,39))
Pound-Star Notation #*((1))*(9)*5 #*((1))*(47)*3
BEAF {10,{10,12}} (exact)
Hyper-E notation E12#2 (exact)
Bashicu matrix system (0)(1)[6] (0)(1)[7]
Hyperfactorial array notation (14!)! (15!)!
Fast-growing hierarchy $$f_2(f_2(36))$$ $$f_2(f_2(37))$$
Hardy hierarchy $$H_{\omega^22}(36)$$ $$H_{\omega^22}(37)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega+2}}}(10)$$

## Sources

-minutia group
n-ary numbers with multipliers
Eyelash mite group: eyelash mite-speck · eyelash mite-crumb · eyelash mite-chunk · (binary/ternary/octal)eyelash mite · eyelash mite-bunch · eyelash mite-crowd · eyelash mite-swarm
Dust mite group: dust mite-speck · dust mite-crumb · dust mite-chunk · (binary/ternary/octal)dust mite · dust mite-bunch · dust mite-crowd · dust mite-swarm
Cheese mite group: cheese mite-speck · cheese mite-crumb · cheese mite-chunk · (binary/ternary/octal)cheese mite · cheese mite-bunch · cheese mite-crowd · cheese mite-swarm
Clover mite group: clover mite-speck · clover mite-crumb · clover mite-chunk · (binary/ternary/octal)clover mite · clover mite-bunch · clover mite-crowd · clover mite-swarm
Pipsqueak group: (binary/ternary/octal)pipsqueak
Little squeaker group: (binary/ternary/octal)little squeaker
Small fry group: (binary/ternary/octal)small fry
Guppy group: (binary/ternary/octal)guppyspeck · (binary/ternary/octal)guppycrumb · (binary/ternary/octal)guppychunk · (ternary/quaternary/quinary/duodecimal/hexadecimal/vigesimal/sexagesimal)guppy(bit/byte)
Minnow group: (binary/ternary/octal)minnowspeck · (binary/ternary/octal)minnowcrumb · (binary/ternary/octal)minnowchunk · (ternary)minnow(bit/byte)
Goby group: (binary/ternary/octal)gobyspeck · (binary/ternary/octal)gobycrumb · (binary/ternary/octal)gobychunk · (ternary)goby(bit/byte)