65,537

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Number

$65 \,537$ (sixty-five thousand, five hundred and thirty-seven) is:

A prime number

The $5$th Fermat number and Fermat prime after $3$, $5$, $17$, $257$:

$65 \,537 = 2^{\paren {2^4} } + 1 = 2^{16} + 1$

Also see

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Sources

• 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $65,537$
• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $65,537$