517718739393 has 6 divisors (see below), whose sum is σ = 747815956914. Its totient is φ = 345145826256.

The previous prime is 517718739379. The next prime is 517718739409. The reversal of 517718739393 is 393937817715.

517718739393 is a `hidden beast` number, since 5 + 17 + 71 + 87 + 393 + 93 = 666.

It can be written as a sum of positive squares in only one way, i.e., 472529758464 + 45188980929 = 687408^2 + 212577^2 .

It is not a de Polignac number, because 517718739393 - 2⁸ = 517718739137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 517718739393.

It is not an unprimeable number, because it can be changed into a prime (517718739493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28762152180 + ... + 28762152197.

It is an arithmetic number, because the mean of its divisors is an integer number (124635992819).

Almost surely, 2^517718739393 is an apocalyptic number.

It is an amenable number.

517718739393 is a deficient number, since it is larger than the sum of its proper divisors (230097217521).

517718739393 is a wasteful number, since it uses less digits than its factorization.

517718739393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57524304383 (or 57524304380 counting only the distinct ones).

The product of its digits is 30005640, while the sum is 63.

The spelling of 517718739393 in words is "five hundred seventeen billion, seven hundred eighteen million, seven hundred thirty-nine thousand, three hundred ninety-three".