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Ten billion can be represented in 34 bits, never mind 64. The hexadecimal representation (in which each digit contains four bits) is 0x2540BE400. The maximum (unsigned) 64-bit integer is 18446744073709551615. This is (2^64)-1, which is essentially the square of (2^32)-1, which is "about" 4 billion. In general, you can estimate that every 10 bits ...


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