165855918 has 16 divisors (see below), whose sum is σ = 335911680. Its totient is φ = 54585336.

The previous prime is 165855913. The next prime is 165855919. The reversal of 165855918 is 819558561.

165855918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165855913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174480 + ... + 175427.

It is an arithmetic number, because the mean of its divisors is an integer number (20994480).

Almost surely, 2^165855918 is an apocalyptic number.

165855918 is an abundant number, since it is smaller than the sum of its proper divisors (170055762).

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

165855918 is a wasteful number, since it uses less digits than its factorization.

165855918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349991.

The product of its digits is 432000, while the sum is 48.

The square root of 165855918 is about 12878.5060468985. The cubic root of 165855918 is about 549.4274129205.

The spelling of 165855918 in words is "one hundred sixty-five million, eight hundred fifty-five thousand, nine hundred eighteen".