165545504 has 24 divisors (see below), whose sum is σ = 331445520. Its totient is φ = 81368896.

The previous prime is 165545503. The next prime is 165545509. The reversal of 165545504 is 405545561.

It is a super-2 number, since 2×165545504² = 54810627789228032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165545503) 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, 41954 + ... + 45729.

It is an arithmetic number, because the mean of its divisors is an integer number (13810230).

Almost surely, 2^165545504 is an apocalyptic number.

It is an amenable number.

165545504 is an abundant number, since it is smaller than the sum of its proper divisors (165900016).

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

165545504 is an equidigital number, since it uses as much as digits as its factorization.

165545504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87752 (or 87744 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 165545504 is about 12866.4487719028. The cubic root of 165545504 is about 549.0844315474.

The spelling of 165545504 in words is "one hundred sixty-five million, five hundred forty-five thousand, five hundred four".