165604957 has 12 divisors (see below), whose sum is σ = 192971676. Its totient is φ = 141704640.

The previous prime is 165604937. The next prime is 165605009. The reversal of 165604957 is 759406561.

It can be written as a sum of positive squares in 2 ways, for example, as 52693081 + 112911876 = 7259^2 + 10626^2 .

It is not a de Polignac number, because 165604957 - 2¹⁵ = 165572189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165604937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29833 + ... + 34945.

It is an arithmetic number, because the mean of its divisors is an integer number (16080973).

Almost surely, 2^165604957 is an apocalyptic number.

It is an amenable number.

165604957 is a deficient number, since it is larger than the sum of its proper divisors (27366719).

165604957 is an equidigital number, since it uses as much as digits as its factorization.

165604957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5788 (or 5781 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 165604957 is about 12868.7589533723. The cubic root of 165604957 is about 549.1501552885.

The spelling of 165604957 in words is "one hundred sixty-five million, six hundred four thousand, nine hundred fifty-seven".