513117718856 has 8 divisors (see below), whose sum is σ = 962095722870. Its totient is φ = 256558859424.

The previous prime is 513117718843. The next prime is 513117718871. The reversal of 513117718856 is 658817711315.

It can be written as a sum of positive squares in only one way, i.e., 415857316900 + 97260401956 = 644870^2 + 311866^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 513117718798 and 513117718807.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32069857421 + ... + 32069857436.

Almost surely, 2^513117718856 is an apocalyptic number.

It is an amenable number.

513117718856 is a deficient number, since it is larger than the sum of its proper divisors (448978004014).

513117718856 is a wasteful number, since it uses less digits than its factorization.

513117718856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64139714863 (or 64139714859 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 53.

The spelling of 513117718856 in words is "five hundred thirteen billion, one hundred seventeen million, seven hundred eighteen thousand, eight hundred fifty-six".