167,772,161

Number
$167 \, 772 \, 161$ is:


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


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