165868 has 6 divisors (see below), whose sum is σ = 290276. Its totient is φ = 82932.

The previous prime is 165857. The next prime is 165877. The reversal of 165868 is 868561.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20730 + ... + 20737.

2¹⁶⁵⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

165868 is a deficient number, since it is larger than the sum of its proper divisors (124408).

165868 is a wasteful number, since it uses less digits than its factorization.

165868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41471 (or 41469 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 165868 is about 407.2689529046. The cubic root of 165868 is about 54.9440753859.

The spelling of 165868 in words is "one hundred sixty-five thousand, eight hundred sixty-eight".