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The number 4,294,967,295 is an integer equal to 2$32$ − 1. It has a factorization of 3 · 5 · 17 · 257 · 65537.

In computing
The number 4,294,967,295, equivalent to the hexadecimal value 7FFF,FFFF$16$, is the maximum value for a 32-bit unsigned integer in computing. It is therefore the maximum value for a variable declared as an unsigned integer (unsigned, unsigned int, or unsigned long int) in many programming languages running on modern computers. The presence of the value may reflect an error, overflow condition, or missing value.

This value is also the largest memory address for 32-bit CPUs. Being an odd value, its appearance may reflect an erroneous (misaligned) memory address. Such a value may also be used as a sentinel value to initialize newly allocated memory for debugging purposes.

The C standard library data type, used on operating systems such as Unix, is typically implemented as either a 32-bit or a 64-bit signed integer value, counting the number of seconds since the start of the Unix epoch (midnight UTC of 1 January 1970). Systems employing a 32-bit type are susceptible to the Year 2038 problem, wherein time values cannot represent a time 232−1 seconds past the epoch, which occurs at 03:14:07 UT on 19 January 2038. Many implementations have moved to a wider 64-bit type, with a maximal signed value of 2$63$−1 corresponding to a point in time 292 billion years from now.