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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 (10)
It is a thousand sextillion and one thousandth of an octillion. 10^24 is equal to a quadrillion in the European System
This number is just a little less than twice as large as Avogadro's number, which is a mole in chemistry.
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 (10)
It is a million sextillion and one millionth of an octillion, or, a thousand sextilliard and one thousandth of a septilliard. 10^42 is equal to a quattuordecillion in the North American System
See also List of numbers.
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