165216444 has 24 divisors (see below), whose sum is σ = 385725648. Its totient is φ = 55040640.

The previous prime is 165216437. The next prime is 165216481. The reversal of 165216444 is 444612561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28774 + ... + 34034.

It is an arithmetic number, because the mean of its divisors is an integer number (16071902).

Almost surely, 2^165216444 is an apocalyptic number.

It is an amenable number.

165216444 is an abundant number, since it is smaller than the sum of its proper divisors (220509204).

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

165216444 is a wasteful number, since it uses less digits than its factorization.

165216444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7885 (or 7883 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 165216444 is about 12853.6548887855. The cubic root of 165216444 is about 548.7203794356.

The spelling of 165216444 in words is "one hundred sixty-five million, two hundred sixteen thousand, four hundred forty-four".