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Quadrillion may mean either of the two numbers (see long and short scales for more detail):
- 1,000,000,000,000,000 (one thousand million million; 1015; SI prefix peta-) for all short scale countries
- 1,000,000,000,000,000,000,000,000 (one million million million million; 1024; SI prefix: yotta-) for all long scale countries
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