4,294,967,297

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Number

$4 \, 294 \, 967 \, 297$ is:

$641 \times 6 \, 700 \, 417$


The $6$th Fermat number after $3$, $5$, $17$, $257$, $65 \, 537$:
$4 \, 294 \, 967 \, 297 = 2^{\paren {2^5} } + 1 = 2^{32} + 1$
and the $1$st not to be prime.


Also see


Sources