518809040656 has 15 divisors (see below), whose sum is σ = 1005198098503. Its totient is φ = 259403079760.

The previous prime is 518809040627. The next prime is 518809040657. The reversal of 518809040656 is 656040908815.

The square root of 518809040656 is 720284.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518809040657) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2791101 + ... + 2971171.

Almost surely, 2^518809040656 is an apocalyptic number.

518809040656 is the 720284-th square number.

It is an amenable number.

518809040656 is a deficient number, since it is larger than the sum of its proper divisors (486389057847).

518809040656 is an frugal number, since it uses more digits than its factorization.

518809040656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360150 (or 180073 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 518809040656 in words is "five hundred eighteen billion, eight hundred nine million, forty thousand, six hundred fifty-six".