518945742639 has 12 divisors (see below), whose sum is σ = 749616865816. Its totient is φ = 345950641872.

The previous prime is 518945742631. The next prime is 518945742659. The reversal of 518945742639 is 936247549815.

518945742639 is a `hidden beast` number, since 5 + 1 + 8 + 9 + 4 + 574 + 26 + 39 = 666.

It is not a de Polignac number, because 518945742639 - 2³ = 518945742631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518945742631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 846589 + ... + 1324614.

Almost surely, 2^518945742639 is an apocalyptic number.

518945742639 is a deficient number, since it is larger than the sum of its proper divisors (230671123177).

518945742639 is a wasteful number, since it uses less digits than its factorization.

518945742639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197766 (or 2197763 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The spelling of 518945742639 in words is "five hundred eighteen billion, nine hundred forty-five million, seven hundred forty-two thousand, six hundred thirty-nine".