165089664 has 80 divisors (see below), whose sum is σ = 491335020. Its totient is φ = 55026432.

The previous prime is 165089633. The next prime is 165089681. The reversal of 165089664 is 466980561.

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 2407 + ... + 18329.

Almost surely, 2^165089664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165089664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245667510).

165089664 is an abundant number, since it is smaller than the sum of its proper divisors (326245356).

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

165089664 is an equidigital number, since it uses as much as digits as its factorization.

165089664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15949 (or 15928 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 165089664 is about 12848.7222711054. The cubic root of 165089664 is about 548.5799887057.

The spelling of 165089664 in words is "one hundred sixty-five million, eighty-nine thousand, six hundred sixty-four".