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What is a Quadrillion?

There are two systems in use for naming numbers larger than a million.

In the American system, the Latin prefix refers to the number of groups of three zeros, not including the last group of three, which represents a thousand. Thus in the USA, a billion is 1,000,000,000 (109) and a quadrillion is a mere 1,000,000,000,000,000. (1015).
In the British system, which is in use in the rest of the world, the Latin prefix represents the power of a million, thus a British billion is 1,000,000,000,000 (1012) and a British quadrillion is 1,000,000,000,000,000,000,000,000 (1024).

If you want to see what a stack of 1 Quadrillion (U.S.) pennies might look like, click here.
To imagine what a stack of 1 Quadrillion pennies looks like in the rest of the world, just view that same page one thousand million times... (If you view it once a second, it should only take you 31.7 years to do this.)









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