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A googolding is a number coined by Sbiis Saibian equal to 10500, coined in analogy to the googolgong. It is equal to 1 followed by 500 zeros. It is the square root of a googolchime.[1] It is also called one hundred quinsexagintacentillion in the short scale. Its full decimal expansion is shown below:

100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

Aarex Tiaokhiao calls this number foohol, 500-noogol, or megesimal-googol.[2]

Username5243 calls this number gooqnicol, and it's equal to 10[1]500 in Username5243's Array Notation.[3]

The number of vacua within a scienficially hypothesized M-Theory multiverse is believed to be at most on the order of 1 googolding.[4]

Googolding is also known as "one hundred cenquinsexagintillion" according to Landon Curt Noll's The English name of a number.

## Approximations in other notations

Notation Lower bound Upper bound
Scientific notation $$1\times10^{500}$$
Arrow notation $$10\uparrow500$$
Steinhaus-Moser Notation 214[3] 215[3]
Copy notation 9[500] 1[501]
Taro's multivariable Ackermann function A(3,1657) A(3,1658)
Pound-Star Notation #*((41))*14 #*((42))*14
BEAF {10,500}
Bashicu matrix system (0)(1)[8] (0)(1)[9]
Hyperfactorial array notation 253! 254!
Fast-growing hierarchy $$f_2(1\,650)$$ $$f_2(1\,651)$$
Hardy hierarchy $$H_{\omega^2}(1\,650)$$ $$H_{\omega^2}(1\,651)$$
Slow-growing hierarchy $$g_{\omega^{\omega^2 \cdot 5}}(10)$$

## 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)