517117711723 has 2 divisors, whose sum is σ = 517117711724. Its totient is φ = 517117711722.

The previous prime is 517117711703. The next prime is 517117711729. The reversal of 517117711723 is 327117711715.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-517117711723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 517117711723.

It is not a weakly prime, because it can be changed into another prime (517117711729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258558855861 + 258558855862.

It is an arithmetic number, because the mean of its divisors is an integer number (258558855862).

Almost surely, 2^517117711723 is an apocalyptic number.

517117711723 is a deficient number, since it is larger than the sum of its proper divisors (1).

517117711723 is an equidigital number, since it uses as much as digits as its factorization.

517117711723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72030, while the sum is 43.

The spelling of 517117711723 in words is "five hundred seventeen billion, one hundred seventeen million, seven hundred eleven thousand, seven hundred twenty-three".