165545425 has 24 divisors (see below), whose sum is σ = 213057792. Its totient is φ = 127464000.

The previous prime is 165545417. The next prime is 165545431. The reversal of 165545425 is 524545561.

165545425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165545425 - 2³ = 165545417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175455 + ... + 176395.

It is an arithmetic number, because the mean of its divisors is an integer number (8877408).

Almost surely, 2^165545425 is an apocalyptic number.

It is an amenable number.

165545425 is a deficient number, since it is larger than the sum of its proper divisors (47512367).

165545425 is a wasteful number, since it uses less digits than its factorization.

165545425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209 (or 1204 counting only the distinct ones).

The product of its digits is 120000, while the sum is 37.

The square root of 165545425 is about 12866.4457019023. The cubic root of 165545425 is about 549.0843442045.

The spelling of 165545425 in words is "one hundred sixty-five million, five hundred forty-five thousand, four hundred twenty-five".