165597916 has 12 divisors (see below), whose sum is σ = 316141560. Its totient is φ = 75271760.

The previous prime is 165597911. The next prime is 165597919. The reversal of 165597916 is 619795561.

It is a self number, because there is not a number n which added to its sum of digits gives 165597916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165597911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1881751 + ... + 1881838.

It is an arithmetic number, because the mean of its divisors is an integer number (26345130).

Almost surely, 2^165597916 is an apocalyptic number.

It is an amenable number.

165597916 is a deficient number, since it is larger than the sum of its proper divisors (150543644).

165597916 is a wasteful number, since it uses less digits than its factorization.

165597916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763604 (or 3763602 counting only the distinct ones).

The product of its digits is 510300, while the sum is 49.

The square root of 165597916 is about 12868.4853809607. The cubic root of 165597916 is about 549.1423724679.

The spelling of 165597916 in words is "one hundred sixty-five million, five hundred ninety-seven thousand, nine hundred sixteen".