167,772,161

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Number

$167 \, 772 \, 161$ is:

The $10 \, 385 \, 401$st prime.

One of the prime factors of the $24$th Fermat number $2^{\left({2^{23} }\right)} + 1$:
$167 \, 772 \, 161 = 5 \times 2^{25} + 1$