165400544 has 24 divisors (see below), whose sum is σ = 339791760. Its totient is φ = 79104256.

The previous prime is 165400513. The next prime is 165400549. The reversal of 165400544 is 445004561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165400549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111629 + ... + 113100.

It is an arithmetic number, because the mean of its divisors is an integer number (14157990).

Almost surely, 2^165400544 is an apocalyptic number.

It is an amenable number.

165400544 is an abundant number, since it is smaller than the sum of its proper divisors (174391216).

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

165400544 is a wasteful number, since it uses less digits than its factorization.

165400544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224762 (or 224754 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 165400544 is about 12860.8142821518. The cubic root of 165400544 is about 548.9241160629.

The spelling of 165400544 in words is "one hundred sixty-five million, four hundred thousand, five hundred forty-four".