65536

65536 is the natural number following 65535 and preceding 65537. It equals 2^16, and in binary it is a 1 followed by sixteen zeros.

In computing, 65536 marks a common boundary for 16‑bit data. An unsigned 16‑bit integer can represent values from 0 through 65535; 65536 is the first value outside that range, often associated with overflow in algorithms and wraparound in 16‑bit arithmetic. The quantity 64 KiB equals 65,536 bytes and has been a standard memory block size in older systems and memory management schemes.

In Unicode, the Basic Multilingual Plane contains 65,536 code points, from U+0000 to U+FFFF, forming the core range for many common characters and historically representing the first major block of Unicode.

In digital color, 16‑bit color depth allows up to 65,536 distinct colors, commonly implemented as 5 bits for red, 6 for green, and 5 for blue (the 5‑6‑5 scheme) per pixel.

The number also appears as a familiar milestone in computing, representing a power of two that underpins several architectural and data‑storage conventions, including memory segmentation, addressable units, and file/packet size demarcations.