52685968981 has 2 divisors, whose sum is σ = 52685968982. Its totient is φ = 52685968980.

The previous prime is 52685968919. The next prime is 52685969023. The reversal of 52685968981 is 18986958625.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50115985956 + 2569983025 = 223866^2 + 50695^2 .

It is a cyclic number.

It is not a de Polignac number, because 52685968981 - 2¹⁷ = 52685837909 is a prime.

It is a super-2 number, since 2×52685968981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52685966981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26342984490 + 26342984491.

It is an arithmetic number, because the mean of its divisors is an integer number (26342984491).

Almost surely, 2^52685968981 is an apocalyptic number.

It is an amenable number.

52685968981 is a deficient number, since it is larger than the sum of its proper divisors (1).

52685968981 is an equidigital number, since it uses as much as digits as its factorization.

52685968981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74649600, while the sum is 67.

The spelling of 52685968981 in words is "fifty-two billion, six hundred eighty-five million, nine hundred sixty-eight thousand, nine hundred eighty-one".