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1015 = 1 000 000 000 000 000

which is one thousand billion or one billiard on the long scale (as used in Europe)

or one quadrillion on the short scale (as used in USA).

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The UK, which IS a part of Europe and the main English speaking one within it, has not used the long scale since the mid 1960s so that part of the answer is misleading.

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14y ago

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