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|Cardinal||sixty-five thousand five hundred thirty-five|
(sixty-five thousand five hundred thirty-fifth)
|Factorization||3 × 5 × 17 × 257|
65535 is the integer after 65534 and before 65536.
65535 is the product of the first four Fermat primes: 65535 = (2 + 1)(4 + 1)(16 + 1)(256 + 1). Because of this property, it is possible to construct with compass and straightedge a regular polygon with 65535 sides. See constructible polygon.
65535 is the 15th 626-gonal number, the 5th 6555-gonal number, and the 3rd 21846-gonal number.
- 65535 occurs frequently in the field of computing because it is (one less than 2 to the 16th power), which is the highest number that can be represented by an unsigned 16-bit binary number. Some computer programming environments may have predefined constant values representing 65535, with names like
- In older computers with processors having a 16-bit address bus (such as the MOS Technology 6502 and the Zilog Z80), 65535 (FFFF16) is the highest addressable memory location, with 0 (000016) being the lowest. Such processors thus support at most 64 KiB of total byte-addressable memory.
- In Internet protocols, 65535 is also the number of TCP and UDP ports available for use, since port 0 is reserved.
- In some implementations of Tiny BASIC, entering a command that divides any number by zero will return 65535.
- In an unpatched version of Microsoft Excel 2007, many mathematical computations evaluating to 65535 will display incorrectly. For example,
=850*77.1displays as 100000 rather than 65535. Microsoft reports this to be a display-only bug for only 6 floating point numbers near 65535 and 65536. These display issues do not occur in editions of Excel that have been updated to Office 2007 service pack 2.
- In Microsoft Word 2011 for Mac, 65535 is the highest line number that will be displayed.