22218538856 has 16 divisors (see below), whose sum is σ = 42127848900. Its totient is φ = 10984445824.

The previous prime is 22218538799. The next prime is 22218538873. The reversal of 22218538856 is 65883581222.

It can be written as a sum of positive squares in 2 ways, for example, as 21442916356 + 775622500 = 146434^2 + 27850^2 .

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, 15602195 + ... + 15603618.

Almost surely, 2^22218538856 is an apocalyptic number.

It is an amenable number.

22218538856 is a deficient number, since it is larger than the sum of its proper divisors (19909310044).

22218538856 is a wasteful number, since it uses less digits than its factorization.

22218538856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31205908 (or 31205904 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 50.

The spelling of 22218538856 in words is "twenty-two billion, two hundred eighteen million, five hundred thirty-eight thousand, eight hundred fifty-six".