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The largest number representable in 64 bits


ost is a rewrite of my earlier blog post from Nov 2023 with many new insights and updates. ┬─┬ ┬─┬────────── ┬─┬─┬ ┬─┬──────────── └─┤ │ │ ──┬────── └─┤ │ │ │ ──┬──────── │ │ │ ┬─┼────── └─┤ │ │ ──┼─┬────── │ │ │ └─┤ ┬─┬── │ │ │ ┬─┼─┼────── │ │ │ │ ┼─┼─┬ │ │ │ └─┤ │ ┬─┬── │ │ │ │ │ ├─┘ │ │ │ └─┤ ┼─┼─┬ │ │ │ │ ├─┘ │ │ │ │ │ ├─┘ │ │ │ ├─┘ │ │ │ │ ├─┘ │ │ ├───┘ │ │ │ ├─┘ │ ├─┘ │ │ ├─────┘ └─┘ │ ├─┘ └─┘ Most people believe 264-1 = 18446744073709551615, or 0xFFFFFFFFFFFFFFFF in hexadecimal, to be the largest number representable in 64 bits.

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