0x4000000000000

0x4000000000000 is a hexadecimal integer literal that represents the value 2^50. In decimal, this equals 1,125,899,906,842,624. In binary, it is a 1 followed by 50 zeros. The hexadecimal form itself is 0x4000000000000, consisting of a single nonzero nibble (4) at the most significant position and zeros elsewhere.

This value is notable because 2^50 bytes constitute one pebibyte (PiB). As such, 0x4000000000000 is often encountered in contexts involving large memory sizes, data capacities, or addressing schemes that use powers of two. In software and hardware discussions, constants like this can serve as memory-size boundaries, or as bit masks with a single bit set at position 50.

In programming practice, literals of this form appear in low-level code that handles memory layout, file sizes, or performance considerations tied to binary multiples. They help express large, exact powers of two in a compact, unambiguous way.

Related power-of-two constants include 0x1000000000000 (2^48) and 0x8000000000000 (2^51), which similarly denote large binary thresholds or masks in hex notation.