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4294967295
The number 4,294,967,295 is an integer equal to 2 − 1. It has a factorization of . Since these factors are the five known Fermat primes, this number is the largest known odd value ''n'' for which a regular ''n''-sided polygon is constructible using compass and straightedge. Equivalently, it is the largest known odd number ''n'' for which the angle can be constructed, or for which can be expressed in terms of square roots. == In computing ==
The number 4,294,967,295, equivalent to the hexadecimal value , 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 (, , or ) 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.
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