2165976816 has 20 divisors (see below), whose sum is σ = 5595440232. Its totient is φ = 721992256.

The previous prime is 2165976797. The next prime is 2165976821. The reversal of 2165976816 is 6186795612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22562211 + ... + 22562306.

Almost surely, 2^2165976816 is an apocalyptic number.

It is an amenable number.

2165976816 is an abundant number, since it is smaller than the sum of its proper divisors (3429463416).

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

2165976816 is a wasteful number, since it uses less digits than its factorization.

2165976816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45124528 (or 45124522 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The square root of 2165976816 is about 46540.0560377832. The cubic root of 2165976816 is about 1293.8519993142.

The spelling of 2165976816 in words is "two billion, one hundred sixty-five million, nine hundred seventy-six thousand, eight hundred sixteen".