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Guppyplex (also called googolsextigong) is equal to 101020 = E20#2 = EE20 using Hyper-E notation.[1] The name was coined by Sbiis Saibian. It is equal to 1 followed by guppy (100 quintillion) zeroes. It is 1020+1 digits long. Writing down the full decimal expansion would take 1014 books of 400 pages each, with 2,500 digits on each page.

Username5243 calls this number goovolplex, and it's equal to 10[1]10[1]20 in Username5243's Array Notation.[2]

## Etymology

The name of this number is formed by appending the plex suffix to the number guppy.

## Names in -illion systems

In the short scale, it is also called:

ten trestriginmillitrestrigintatrecenmillitrestrigintatrecenmillitrestrigintatrecenmillitrestrigintatrecenmillitrestrigintatrecenmilliduotrigintatrecentillion

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

ten tretriginmilliamilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliamilliatrecentretriginmilliamilliamilliamilliatrecentretriginmilliamilliamilliatrecentretriginmilliamilliatrecentretriginmilliatrecenduotrigintillion

## Approximations in other notations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{100,000,000,000,000,000,000}$$
Arrow notation $$10\uparrow10\uparrow20$$
Down-arrow notation $$10\downarrow\downarrow21$$
Steinhaus-Moser Notation 15[3][3] 16[3][3]
Copy notation 9[9[20]] 1[1[21]]
H* function H(33H(5)) H(34H(5))
Taro's multivariable Ackermann function A(3,A(3,65)) A(3,A(3,66))
Pound-Star Notation #*((1))*(3)*17 #*((1))*(2,1,4)*3
BEAF {10,{10,20}}
Bashicu matrix system (0)(1)[8] (0)(1)[9]
Hyperfactorial array notation (20!)! (21!)!
Fast-growing hierarchy $$f_2(f_2(62))$$ $$f_2(f_2(63))$$
Hardy hierarchy $$H_{\omega^22}(62)$$ $$H_{\omega^22}(63)$$
Slow-growing hierarchy $$g_{\omega^{\omega^{\omega2}}}(10)$$

## Sources

1. Saibian, Sbiis. Hyper-E Numbers. Retrieved 2016-07-25.
2. Part 1 - My Large Numbers

-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)