165045138 has 16 divisors (see below), whose sum is σ = 335502336. Its totient is φ = 54113040.

The previous prime is 165045113. The next prime is 165045149. The reversal of 165045138 is 831540561.

165045138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 165045099 and 165045108.

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, 225106 + ... + 225837.

It is an arithmetic number, because the mean of its divisors is an integer number (20968896).

Almost surely, 2^165045138 is an apocalyptic number.

165045138 is an abundant number, since it is smaller than the sum of its proper divisors (170457198).

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

165045138 is a wasteful number, since it uses less digits than its factorization.

165045138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451009.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 165045138 is about 12846.9894527862. The cubic root of 165045138 is about 548.5306654707.

Adding to 165045138 its reverse (831540561), we get a palindrome (996585699).

The spelling of 165045138 in words is "one hundred sixty-five million, forty-five thousand, one hundred thirty-eight".