2159991764 has 12 divisors (see below), whose sum is σ = 4319983584. Its totient is φ = 925710744.

The previous prime is 2159991703. The next prime is 2159991787. The reversal of 2159991764 is 4671999512.

2159991764 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38571254 + ... + 38571309.

It is an arithmetic number, because the mean of its divisors is an integer number (359998632).

Almost surely, 2^2159991764 is an apocalyptic number.

It is an amenable number.

2159991764 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2159991764 is a wasteful number, since it uses less digits than its factorization.

2159991764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77142574 (or 77142572 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 53.

The square root of 2159991764 is about 46475.7115491522. The cubic root of 2159991764 is about 1292.6591710611.

The spelling of 2159991764 in words is "two billion, one hundred fifty-nine million, nine hundred ninety-one thousand, seven hundred sixty-four".