165238555 has 16 divisors (see below), whose sum is σ = 219081024. Its totient is φ = 119004160.

The previous prime is 165238519. The next prime is 165238561. The reversal of 165238555 is 555832561.

It is not a de Polignac number, because 165238555 - 2¹⁵ = 165205787 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40306 + ... + 44215.

It is an arithmetic number, because the mean of its divisors is an integer number (13692564).

Almost surely, 2^165238555 is an apocalyptic number.

165238555 is a deficient number, since it is larger than the sum of its proper divisors (53842469).

165238555 is a wasteful number, since it uses less digits than its factorization.

165238555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84566.

The product of its digits is 180000, while the sum is 40.

The square root of 165238555 is about 12854.5149655675. The cubic root of 165238555 is about 548.7448568520.

The spelling of 165238555 in words is "one hundred sixty-five million, two hundred thirty-eight thousand, five hundred fifty-five".