165904916 has 12 divisors (see below), whose sum is σ = 290678388. Its totient is φ = 82853952.

The previous prime is 165904913. The next prime is 165904927. The reversal of 165904916 is 619409561.

It can be written as a sum of positive squares in 2 ways, for example, as 144096016 + 21808900 = 12004^2 + 4670^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165904913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20771 + ... + 27626.

It is an arithmetic number, because the mean of its divisors is an integer number (24223199).

Almost surely, 2^165904916 is an apocalyptic number.

It is an amenable number.

165904916 is a deficient number, since it is larger than the sum of its proper divisors (124773472).

165904916 is a wasteful number, since it uses less digits than its factorization.

165904916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49258 (or 49256 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 165904916 is about 12880.4082233445. The cubic root of 165904916 is about 549.4815124750.

The spelling of 165904916 in words is "one hundred sixty-five million, nine hundred four thousand, nine hundred sixteen".