2165117165 has 32 divisors (see below), whose sum is σ = 2773305600. Its totient is φ = 1618030080.

The previous prime is 2165117137. The next prime is 2165117173. The reversal of 2165117165 is 5617115612.

It is not a de Polignac number, because 2165117165 - 2⁸ = 2165116909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4001795 + ... + 4002335.

It is an arithmetic number, because the mean of its divisors is an integer number (86665800).

Almost surely, 2^2165117165 is an apocalyptic number.

It is an amenable number.

2165117165 is a deficient number, since it is larger than the sum of its proper divisors (608188435).

2165117165 is a wasteful number, since it uses less digits than its factorization.

2165117165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077.

The product of its digits is 12600, while the sum is 35.

The square root of 2165117165 is about 46530.8195178207. The cubic root of 2165117165 is about 1293.6808050618.

The spelling of 2165117165 in words is "two billion, one hundred sixty-five million, one hundred seventeen thousand, one hundred sixty-five".