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A septillion is equal to 1024 in America, or 1042 in France and Germany.[1]

This number is also called oktillion (not to be confused with octillion) in Russ Rowlett's Greek-based naming system.[2]

Aarex Tiaokhiao gave the name okyillion, referring to the value of this number.[3]

Sbiis Saibian gave the name minnowchunk, referring to the short scale value of this number.[4]

1024 is also called Zi (秭 in Chinese) or Jyo (じょ in Japanese)[5] in both Japanese counting system and Chinese counting system.

## Decimal Edit

• 1,000,000,000,000,000,000,000,000 - short scale
• 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000 - long scale

## Examples Edit

• One liter of water contains about 33.4 septillion water molecules.
• The earth has a mass of about 5.98 septillion kilograms.[6]
• The constant of weak nuclear force is about 10 septillion times larger than constant of gravity.
• The SI prefix yotta- multiplies by one septillion.
• A septillion dollars will fill the US with a layer of 1000 metres thick.

## Approximations Edit

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{24}$$
Arrow notation $$10\uparrow24$$
Steinhaus-Moser Notation 18[3] 19[3]
Copy notation 9[24] 1[25]
Taro's multivariable Ackermann function A(3,76) A(3,77)
Pound-Star Notation #*(1,2,3,3)*5 #*(2,2,3,3)*5
BEAF {10,24}
Hyper-E notation E24
Bashicu matrix system (0)(0)(0)[1000]
Hyperfactorial array notation 24! 25!
Fast-growing hierarchy $$f_2(73)$$ $$f_2(74)$$
Hardy hierarchy $$H_{\omega^2}(73)$$ $$H_{\omega^2}(74)$$
Slow-growing hierarchy $$g_{\omega^{\omega2+4}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{42}$$
Arrow notation $$10\uparrow42$$
Steinhaus-Moser Notation 28[3] 29[3]
Copy notation 9[42] 1[43]
Taro's multivariable Ackermann function A(3,136) A(3,137)
Pound-Star Notation #*(7,6,6,0,4)*6 #*(8,6,6,0,4)*6
BEAF {10,42}
Hyper-E notation E42
Bashicu matrix system (0)(0)(0)(0)[421] (0)(0)(0)(0)[422]
Hyperfactorial array notation 36! 37!
Fast-growing hierarchy $$f_2(132)$$ $$f_2(133)$$
Hardy hierarchy $$H_{\omega^2}(132)$$ $$H_{\omega^2}(133)$$
Slow-growing hierarchy $$g_{\omega^{\omega4+2}}(10)$$

## Sources Edit

-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)