165905564 has 24 divisors (see below), whose sum is σ = 317520000. Its totient is φ = 75223280.

The previous prime is 165905513. The next prime is 165905569. The reversal of 165905564 is 465509561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165905569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13937 + ... + 22935.

It is an arithmetic number, because the mean of its divisors is an integer number (13230000).

Almost surely, 2^165905564 is an apocalyptic number.

It is an amenable number.

165905564 is a deficient number, since it is larger than the sum of its proper divisors (151614436).

165905564 is a wasteful number, since it uses less digits than its factorization.

165905564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9433 (or 9431 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 165905564 is about 12880.4333778022. The cubic root of 165905564 is about 549.4822278718.

The spelling of 165905564 in words is "one hundred sixty-five million, nine hundred five thousand, five hundred sixty-four".