165957113 has 4 divisors (see below), whose sum is σ = 189665280. Its totient is φ = 142248948.

The previous prime is 165957097. The next prime is 165957119. The reversal of 165957113 is 311759561.

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: 311759561 = 563 ⋅553747.

It is a cyclic number.

It is not a de Polignac number, because 165957113 - 2⁴ = 165957097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165957119) 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, 11854073 + ... + 11854086.

It is an arithmetic number, because the mean of its divisors is an integer number (47416320).

Almost surely, 2^165957113 is an apocalyptic number.

It is an amenable number.

165957113 is a deficient number, since it is larger than the sum of its proper divisors (23708167).

165957113 is an equidigital number, since it uses as much as digits as its factorization.

165957113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23708166.

The product of its digits is 28350, while the sum is 38.

The square root of 165957113 is about 12882.4342808337. The cubic root of 165957113 is about 549.5391323852.

The spelling of 165957113 in words is "one hundred sixty-five million, nine hundred fifty-seven thousand, one hundred thirteen".