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A septillion is a large number equal to a 1 with 24 0's, namely: 1,000,000,000,000,000,000,000,000
This number is just a little less than twice as large as Avogadro's number, which is a mole in chemistry.
It is a thousand sextillion and one thousandth of an octillion.
European Usage
A septillion is equal to a 1 with 42 0's, namely: 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000
It is a million sextillion and one millionth of an octillion, or, a thousand sextilliard and one thousands of a septilliard.
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