518221045682 has 54 divisors (see below), whose sum is σ = 834061925853. Its totient is φ = 241450779744.

The previous prime is 518221045673. The next prime is 518221045717. The reversal of 518221045682 is 286540122815.

It can be written as a sum of positive squares in 2 ways, for example, as 515838531961 + 2382513721 = 718219^2 + 48811^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=509029.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1412046263 + ... + 1412046629.

Almost surely, 2^518221045682 is an apocalyptic number.

518221045682 is a deficient number, since it is larger than the sum of its proper divisors (315840880171).

518221045682 is an frugal number, since it uses more digits than its factorization.

518221045682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 44.

The spelling of 518221045682 in words is "five hundred eighteen billion, two hundred twenty-one million, forty-five thousand, six hundred eighty-two".