22155638818 has 32 divisors (see below), whose sum is σ = 34232284800. Its totient is φ = 10750126464.

The previous prime is 22155638801. The next prime is 22155638831. The reversal of 22155638818 is 81883655122.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8368771 + ... + 8371417.

It is an arithmetic number, because the mean of its divisors is an integer number (1069758900).

Almost surely, 2^22155638818 is an apocalyptic number.

22155638818 is a deficient number, since it is larger than the sum of its proper divisors (12076645982).

22155638818 is a wasteful number, since it uses less digits than its factorization.

22155638818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3594.

The product of its digits is 921600, while the sum is 49.

The spelling of 22155638818 in words is "twenty-two billion, one hundred fifty-five million, six hundred thirty-eight thousand, eight hundred eighteen".