517807142681 has 2 divisors, whose sum is σ = 517807142682. Its totient is φ = 517807142680.

The previous prime is 517807142669. The next prime is 517807142689. The reversal of 517807142681 is 186241708715.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 356905877056 + 160901265625 = 597416^2 + 401125^2 .

It is a cyclic number.

It is not a de Polignac number, because 517807142681 - 2³⁸ = 242929235737 is a prime.

It is a super-2 number, since 2×517807142681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (517807142689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258903571340 + 258903571341.

It is an arithmetic number, because the mean of its divisors is an integer number (258903571341).

Almost surely, 2^517807142681 is an apocalyptic number.

It is an amenable number.

517807142681 is a deficient number, since it is larger than the sum of its proper divisors (1).

517807142681 is an equidigital number, since it uses as much as digits as its factorization.

517807142681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 517807142681 in words is "five hundred seventeen billion, eight hundred seven million, one hundred forty-two thousand, six hundred eighty-one".