165213055 has 24 divisors (see below), whose sum is σ = 244196208. Its totient is φ = 106622208.

The previous prime is 165213053. The next prime is 165213079. The reversal of 165213055 is 550312561.

It is not a de Polignac number, because 165213055 - 2¹ = 165213053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165213053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15669 + ... + 23998.

It is an arithmetic number, because the mean of its divisors is an integer number (10174842).

Almost surely, 2^165213055 is an apocalyptic number.

165213055 is a deficient number, since it is larger than the sum of its proper divisors (78983153).

165213055 is a wasteful number, since it uses less digits than its factorization.

165213055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39703 (or 39696 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 165213055 is about 12853.5230579013. The cubic root of 165213055 is about 548.7166275369.

The spelling of 165213055 in words is "one hundred sixty-five million, two hundred thirteen thousand, fifty-five".