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Quadrillion

The quadrillion is a large number which has one of two values depending on where it is used:

American usage

In Brazil and the English-speaking world, a quadrillion is equal to a 1 with 15 zeroes, namely: 1,000,000,000,000,000 (10¹⁵)

It is a thousand million million. The SI prefix for this number is peta-. The Rowlett equivalent is pentillion.

European usage

In most European countries, a quadrillion is equal to a 1 with 24 zeroes, namely: 1,000,000,000,000,000,000,000,000 (10²⁴)

It is a million million million million. The SI prefix for this number is yotta-.

While people in the British Isles, Australia and New Zealand traditionally employed the European usage, they have largely switched to the U.S. version.

See also

List of numbers.