22215665728 has 28 divisors (see below), whose sum is σ = 44406011772. Its totient is φ = 11026749440.

The previous prime is 22215665699. The next prime is 22215665737. The reversal of 22215665728 is 82756651222.

It can be written as a sum of positive squares in 2 ways, for example, as 4132946944 + 18082718784 = 64288^2 + 134472^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1258093 + ... + 1275628.

Almost surely, 2^22215665728 is an apocalyptic number.

It is an amenable number.

22215665728 is a deficient number, since it is larger than the sum of its proper divisors (22190346044).

22215665728 is a wasteful number, since it uses less digits than its factorization.

22215665728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2533870 (or 2533860 counting only the distinct ones).

The product of its digits is 806400, while the sum is 46.

The spelling of 22215665728 in words is "twenty-two billion, two hundred fifteen million, six hundred sixty-five thousand, seven hundred twenty-eight".