165038657 has 4 divisors (see below), whose sum is σ = 188615616. Its totient is φ = 141461700.

The previous prime is 165038633. The next prime is 165038683. The reversal of 165038657 is 756830561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 756830561 = 1733 ⋅436717.

It is a cyclic number.

It is not a de Polignac number, because 165038657 - 2²⁰ = 163990081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165038957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11788469 + ... + 11788482.

It is an arithmetic number, because the mean of its divisors is an integer number (47153904).

Almost surely, 2^165038657 is an apocalyptic number.

It is an amenable number.

165038657 is a deficient number, since it is larger than the sum of its proper divisors (23576959).

165038657 is an equidigital number, since it uses as much as digits as its factorization.

165038657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23576958.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 165038657 is about 12846.7372122263. The cubic root of 165038657 is about 548.5234854677.

The spelling of 165038657 in words is "one hundred sixty-five million, thirty-eight thousand, six hundred fifty-seven".