  # Quintillion vs. Quadrillion — What's the Difference? ## Compare with Definitions

#### Quintillion

The cardinal number equal to 1018.
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The cardinal number equal to 1015.
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#### Quintillion

Chiefly British The cardinal number equal to 1030.
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Chiefly British The cardinal number equal to 1024.
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#### Quintillion

A billion billion: 1 followed by eighteen zeros, 1018.
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A thousand trillion ([https://en.wikipedia.org/wiki/Long_and_short_scales#Comparison logic: 1,000 × 1,000^4]): 1 followed by fifteen zeros, 1015.
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#### Quintillion

A million quadrillion: 1 followed by 30 zeros, 1030.
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A million trillion ([https://en.wikipedia.org/wiki/Long_and_short_scales#Comparison logic: 1,000 × 1,000,000^2]): 1 followed by twenty-four zeros, 1024.
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#### Quintillion

Any very large number, exceeding normal description.
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Any very large number, exceeding normal description.
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#### Quintillion

The number that is represented as a one followed by 18 zeros
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According to the French notation, which is followed also upon the Continent and in the United States, a unit with fifteen ciphers annexed; according to the English notation, the number produced by involving a million to the fourth power, or the number represented by a unit with twenty-four ciphers annexed. See the Note under Numeration.
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The number that is represented as a one followed by 24 zeros;
In England they call a septillion a quadrillion
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