5108515775981 has 2 divisors, whose sum is σ = 5108515775982. Its totient is φ = 5108515775980.

The previous prime is 5108515775959. The next prime is 5108515776031. The reversal of 5108515775981 is 1895775158015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4974639552100 + 133876223881 = 2230390^2 + 365891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5108515775981 is a prime.

It is a super-2 number, since 2×5108515775981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5108515775681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2554257887990 + 2554257887991.

It is an arithmetic number, because the mean of its divisors is an integer number (2554257887991).

Almost surely, 2^{5108515775981} is an apocalyptic number.

It is an amenable number.

5108515775981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5108515775981 is an equidigital number, since it uses as much as digits as its factorization.

5108515775981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640000, while the sum is 62.

The spelling of 5108515775981 in words is "five trillion, one hundred eight billion, five hundred fifteen million, seven hundred seventy-five thousand, nine hundred eighty-one".