165164251 has 24 divisors (see below), whose sum is σ = 203065920. Its totient is φ = 133725312.

The previous prime is 165164239. The next prime is 165164257. The reversal of 165164251 is 152461561.

It is not a de Polignac number, because 165164251 - 2¹³ = 165156059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165164257) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65551 + ... + 68023.

It is an arithmetic number, because the mean of its divisors is an integer number (8461080).

Almost surely, 2^165164251 is an apocalyptic number.

165164251 is a deficient number, since it is larger than the sum of its proper divisors (37901669).

165164251 is a wasteful number, since it uses less digits than its factorization.

165164251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563 (or 2556 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 165164251 is about 12851.6244498507. The cubic root of 165164251 is about 548.6625918482.

The spelling of 165164251 in words is "one hundred sixty-five million, one hundred sixty-four thousand, two hundred fifty-one".