2165765772 has 24 divisors (see below), whose sum is σ = 5216468992. Its totient is φ = 698634000.

The previous prime is 2165765761. The next prime is 2165765843. The reversal of 2165765772 is 2775675612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2910604 + ... + 2911347.

Almost surely, 2^2165765772 is an apocalyptic number.

It is an amenable number.

2165765772 is an abundant number, since it is smaller than the sum of its proper divisors (3050703220).

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

2165765772 is a wasteful number, since it uses less digits than its factorization.

2165765772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5821989 (or 5821987 counting only the distinct ones).

The product of its digits is 1234800, while the sum is 48.

The square root of 2165765772 is about 46537.7886453579. The cubic root of 2165765772 is about 1293.8099753848.

The spelling of 2165765772 in words is "two billion, one hundred sixty-five million, seven hundred sixty-five thousand, seven hundred seventy-two".