64-bit computing - Wikipedia
https://en.wikipedia.org/wiki/64-bit_computing
OverviewArchitectural implicationsHistoryLimits of processors64-bit applications64-bit data modelsCurrent 64-bit architecturesSee alsoIn computer architecture, 64-bit integers, memory addresses, or other data units are those that are 64 bits wide. Also, 64-bit central processing units (CPU) and arithmetic logic units (ALU) are those that are based on processor registers, address buses, or data buses of that size. A computer that uses such a processor is a 64-bit computer. From the software perspective, 64-bit computing means the use of machine code with 64-bit virtual memory
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