2156715165 has 16 divisors (see below), whose sum is σ = 3764448576. Its totient is φ = 1045680000.

The previous prime is 2156715161. The next prime is 2156715173. The reversal of 2156715165 is 5615176512.

It is a happy number.

It is not a de Polignac number, because 2156715165 - 2² = 2156715161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156715161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6535336 + ... + 6535665.

It is an arithmetic number, because the mean of its divisors is an integer number (235278036).

Almost surely, 2^2156715165 is an apocalyptic number.

It is an amenable number.

2156715165 is a deficient number, since it is larger than the sum of its proper divisors (1607733411).

2156715165 is a wasteful number, since it uses less digits than its factorization.

2156715165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13071020.

The product of its digits is 63000, while the sum is 39.

The square root of 2156715165 is about 46440.4475107637. The cubic root of 2156715165 is about 1292.0052072640.

The spelling of 2156715165 in words is "two billion, one hundred fifty-six million, seven hundred fifteen thousand, one hundred sixty-five".