2165775372 has 18 divisors (see below), whose sum is σ = 5474598948. Its totient is φ = 721925112.

The previous prime is 2165775371. The next prime is 2165775433. The reversal of 2165775372 is 2735775612.

2165775372 is a `hidden beast` number, since 2 + 1 + 6 + 577 + 5 + 3 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (2165775371) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 30080178 + ... + 30080249.

It is an arithmetic number, because the mean of its divisors is an integer number (304144386).

Almost surely, 2^2165775372 is an apocalyptic number.

It is an amenable number.

2165775372 is an abundant number, since it is smaller than the sum of its proper divisors (3308823576).

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

2165775372 is a wasteful number, since it uses less digits than its factorization.

2165775372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60160437 (or 60160432 counting only the distinct ones).

The product of its digits is 617400, while the sum is 45.

The square root of 2165775372 is about 46537.8917872308. The cubic root of 2165775372 is about 1293.8118870347.

The spelling of 2165775372 in words is "two billion, one hundred sixty-five million, seven hundred seventy-five thousand, three hundred seventy-two".