517718810957 has 4 divisors (see below), whose sum is σ = 518402720316. Its totient is φ = 517034901600.

The previous prime is 517718810941. The next prime is 517718810971. The reversal of 517718810957 is 759018817715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109839879241 + 407878931716 = 331421^2 + 638654^2 .

It is a cyclic number.

It is not a de Polignac number, because 517718810957 - 2⁴ = 517718810941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 517718810896 and 517718810905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517718810657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341953544 + ... + 341955057.

It is an arithmetic number, because the mean of its divisors is an integer number (129600680079).

Almost surely, 2^517718810957 is an apocalyptic number.

It is an amenable number.

517718810957 is a deficient number, since it is larger than the sum of its proper divisors (683909359).

517718810957 is an equidigital number, since it uses as much as digits as its factorization.

517718810957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683909358.

The product of its (nonzero) digits is 4939200, while the sum is 59.

The spelling of 517718810957 in words is "five hundred seventeen billion, seven hundred eighteen million, eight hundred ten thousand, nine hundred fifty-seven".