165913025 has 12 divisors (see below), whose sum is σ = 205974912. Its totient is φ = 132573840.

The previous prime is 165913021. The next prime is 165913061. The reversal of 165913025 is 520319561.

It is not a de Polignac number, because 165913025 - 2² = 165913021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165912982 and 165913000.

It is not an unprimeable number, because it can be changed into a prime (165913021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20744 + ... + 27606.

It is an arithmetic number, because the mean of its divisors is an integer number (17164576).

Almost surely, 2^165913025 is an apocalyptic number.

It is an amenable number.

165913025 is a deficient number, since it is larger than the sum of its proper divisors (40061887).

165913025 is an equidigital number, since it uses as much as digits as its factorization.

165913025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7840 (or 7835 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 165913025 is about 12880.7229998941. The cubic root of 165913025 is about 549.4904647373.

The spelling of 165913025 in words is "one hundred sixty-five million, nine hundred thirteen thousand, twenty-five".