516798042581 has 2 divisors, whose sum is σ = 516798042582. Its totient is φ = 516798042580.

The previous prime is 516798042577. The next prime is 516798042617. The reversal of 516798042581 is 185240897615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 399214203556 + 117583839025 = 631834^2 + 342905^2 .

It is a cyclic number.

It is not a de Polignac number, because 516798042581 - 2² = 516798042577 is a prime.

It is a super-2 number, since 2×516798042581² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (516798042521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258399021290 + 258399021291.

It is an arithmetic number, because the mean of its divisors is an integer number (258399021291).

Almost surely, 2^516798042581 is an apocalyptic number.

It is an amenable number.

516798042581 is a deficient number, since it is larger than the sum of its proper divisors (1).

516798042581 is an equidigital number, since it uses as much as digits as its factorization.

516798042581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 516798042581 in words is "five hundred sixteen billion, seven hundred ninety-eight million, forty-two thousand, five hundred eighty-one".