2165368864 has 12 divisors (see below), whose sum is σ = 4263070014. Its totient is φ = 1082684416.

The previous prime is 2165368847. The next prime is 2165368867. The reversal of 2165368864 is 4688635612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1525683600 + 639685264 = 39060^2 + 25292^2 .

It is not an unprimeable number, because it can be changed into a prime (2165368867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33833857 + ... + 33833920.

Almost surely, 2^2165368864 is an apocalyptic number.

It is an amenable number.

2165368864 is a deficient number, since it is larger than the sum of its proper divisors (2097701150).

2165368864 is an equidigital number, since it uses as much as digits as its factorization.

2165368864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67667787 (or 67667779 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The square root of 2165368864 is about 46533.5240874791. The cubic root of 2165368864 is about 1293.7309340730.

The spelling of 2165368864 in words is "two billion, one hundred sixty-five million, three hundred sixty-eight thousand, eight hundred sixty-four".