165918 has 8 divisors (see below), whose sum is σ = 331848. Its totient is φ = 55304.

The previous prime is 165901. The next prime is 165931. The reversal of 165918 is 819561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

165918 is an admirable number.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

165918 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13821 + ... + 13832.

It is an arithmetic number, because the mean of its divisors is an integer number (41481).

2¹⁶⁵⁹¹⁸ is an apocalyptic number.

165918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165918 is a wasteful number, since it uses less digits than its factorization.

165918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27658.

The product of its digits is 2160, while the sum is 30.

The square root of 165918 is about 407.3303327767. The cubic root of 165918 is about 54.9495956948.

The spelling of 165918 in words is "one hundred sixty-five thousand, nine hundred eighteen".