518218656772 has 12 divisors (see below), whose sum is σ = 907167765196. Its totient is φ = 259027866720.

The previous prime is 518218656751. The next prime is 518218656773. The reversal of 518218656772 is 277656812815.

It can be written as a sum of positive squares in 2 ways, for example, as 87796060416 + 430422596356 = 296304^2 + 656066^2 .

It is not an unprimeable number, because it can be changed into a prime (518218656773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20351103 + ... + 20376550.

Almost surely, 2^518218656772 is an apocalyptic number.

It is an amenable number.

518218656772 is a deficient number, since it is larger than the sum of its proper divisors (388949108424).

518218656772 is a wasteful number, since it uses less digits than its factorization.

518218656772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40730838 (or 40730836 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 58.

The spelling of 518218656772 in words is "five hundred eighteen billion, two hundred eighteen million, six hundred fifty-six thousand, seven hundred seventy-two".