2165864384 has 14 divisors (see below), whose sum is σ = 4297887264. Its totient is φ = 1082932160.

The previous prime is 2165864381. The next prime is 2165864399. The reversal of 2165864384 is 4834685612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165864381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16920752 + ... + 16920879.

Almost surely, 2^2165864384 is an apocalyptic number.

It is an amenable number.

2165864384 is a deficient number, since it is larger than the sum of its proper divisors (2132022880).

2165864384 is an equidigital number, since it uses as much as digits as its factorization.

2165864384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33841643 (or 33841633 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 47.

The square root of 2165864384 is about 46538.8481163855. The cubic root of 2165864384 is about 1293.8296117423.

The spelling of 2165864384 in words is "two billion, one hundred sixty-five million, eight hundred sixty-four thousand, three hundred eighty-four".