2156515165 has 32 divisors (see below), whose sum is σ = 2996248320. Its totient is φ = 1459497984.

The previous prime is 2156515157. The next prime is 2156515183. The reversal of 2156515165 is 5615156512.

It is not a de Polignac number, because 2156515165 - 2³ = 2156515157 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, 1062882 + ... + 1064908.

It is an arithmetic number, because the mean of its divisors is an integer number (93632760).

Almost surely, 2^2156515165 is an apocalyptic number.

It is an amenable number.

2156515165 is a deficient number, since it is larger than the sum of its proper divisors (839733155).

2156515165 is a wasteful number, since it uses less digits than its factorization.

2156515165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421.

The product of its digits is 45000, while the sum is 37.

The square root of 2156515165 is about 46438.2941654837. The cubic root of 2156515165 is about 1291.9652685903.

The spelling of 2156515165 in words is "two billion, one hundred fifty-six million, five hundred fifteen thousand, one hundred sixty-five".