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What is a Quindecillion?

A quindecillion is a number that is equal to 1 followed by 15 zeros. It is written as 10^15 or 15,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000.
It is a very large number that is greater than the number of atoms in the observable universe (estimated to be around 10^80). It is also much larger than the number of particles in the known universe, which is estimated to be around 10^60.
The term quindecillion was coined by the mathematician Edward Kasner, who was trying to come up with a name for this large number. He asked his nephew, Milton Sirotta, to suggest a name, and Sirotta came up with the word quindecillion. It is not a commonly used term in mathematics or science, but it has been used in some contexts to describe very large numbers.

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