165215165 has 16 divisors (see below), whose sum is σ = 209131200. Its totient is φ = 124952832.

The previous prime is 165215161. The next prime is 165215179. The reversal of 165215165 is 561512561.

It is a cyclic number.

It is not a de Polignac number, because 165215165 - 2² = 165215161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165215161) 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 15 ways as a sum of consecutive naturals, for example, 51941 + ... + 55029.

It is an arithmetic number, because the mean of its divisors is an integer number (13070700).

Almost surely, 2^165215165 is an apocalyptic number.

It is an amenable number.

165215165 is a deficient number, since it is larger than the sum of its proper divisors (43916035).

165215165 is a wasteful number, since it uses less digits than its factorization.

165215165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676.

The product of its digits is 9000, while the sum is 32.

The square root of 165215165 is about 12853.6051363032. The cubic root of 165215165 is about 548.7189634846.

The spelling of 165215165 in words is "one hundred sixty-five million, two hundred fifteen thousand, one hundred sixty-five".