518668838372 has 6 divisors (see below), whose sum is σ = 907670467158. Its totient is φ = 259334419184.

The previous prime is 518668838323. The next prime is 518668838377. The reversal of 518668838372 is 273838866815.

It can be written as a sum of positive squares in only one way, i.e., 474423398656 + 44245439716 = 688784^2 + 210346^2 .

It is a super-2 number, since 2×518668838372² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 518668838299 and 518668838308.

It is not an unprimeable number, because it can be changed into a prime (518668838377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64833604793 + ... + 64833604800.

It is an arithmetic number, because the mean of its divisors is an integer number (151278411193).

Almost surely, 2^518668838372 is an apocalyptic number.

It is an amenable number.

518668838372 is a deficient number, since it is larger than the sum of its proper divisors (389001628786).

518668838372 is a wasteful number, since it uses less digits than its factorization.

518668838372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129667209597 (or 129667209595 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 65.

The spelling of 518668838372 in words is "five hundred eighteen billion, six hundred sixty-eight million, eight hundred thirty-eight thousand, three hundred seventy-two".