2165138968 has 16 divisors (see below), whose sum is σ = 4083947280. Its totient is φ = 1076086368.

The previous prime is 2165138959. The next prime is 2165138981. The reversal of 2165138968 is 8698315612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808971 + ... + 811642.

It is an arithmetic number, because the mean of its divisors is an integer number (255246705).

Almost surely, 2^2165138968 is an apocalyptic number.

It is an amenable number.

2165138968 is a deficient number, since it is larger than the sum of its proper divisors (1918808312).

2165138968 is a wasteful number, since it uses less digits than its factorization.

2165138968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620786 (or 1620782 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The square root of 2165138968 is about 46531.0538028100. The cubic root of 2165138968 is about 1293.6851475563.

The spelling of 2165138968 in words is "two billion, one hundred sixty-five million, one hundred thirty-eight thousand, nine hundred sixty-eight".