165161025 has 72 divisors (see below), whose sum is σ = 317035264. Its totient is φ = 85147200.

The previous prime is 165161021. The next prime is 165161041. The reversal of 165161025 is 520161561.

It is a happy number.

165161025 is a `hidden beast` number, since 1 + 651 + 6 + 1 + 0 + 2 + 5 = 666.

It is not a de Polignac number, because 165161025 - 2² = 165161021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 165161025.

It is not an unprimeable number, because it can be changed into a prime (165161021) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 187887 + ... + 188763.

Almost surely, 2^165161025 is an apocalyptic number.

165161025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165161025 is a deficient number, since it is larger than the sum of its proper divisors (151874239).

165161025 is an equidigital number, since it uses as much as digits as its factorization.

165161025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933 (or 916 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 165161025 is about 12851.4989398124. The cubic root of 165161025 is about 548.6590196526.

The spelling of 165161025 in words is "one hundred sixty-five million, one hundred sixty-one thousand, twenty-five".