165813804 has 60 divisors (see below), whose sum is σ = 466825744. Its totient is φ = 51018336.

The previous prime is 165813787. The next prime is 165813899. The reversal of 165813804 is 408318561.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 15472 + ... + 23895.

Almost surely, 2^165813804 is an apocalyptic number.

It is an amenable number.

165813804 is an abundant number, since it is smaller than the sum of its proper divisors (301011940).

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

165813804 is a wasteful number, since it uses less digits than its factorization.

165813804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39396 (or 39385 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 165813804 is about 12876.8708931945. The cubic root of 165813804 is about 549.3809055965.

The spelling of 165813804 in words is "one hundred sixty-five million, eight hundred thirteen thousand, eight hundred four".