52856322581 has 2 divisors, whose sum is σ = 52856322582. Its totient is φ = 52856322580.

The previous prime is 52856322511. The next prime is 52856322601. The reversal of 52856322581 is 18522365825.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49699568356 + 3156754225 = 222934^2 + 56185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52856322581 is a prime.

It is a super-2 number, since 2×52856322581² (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 (52856322511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26428161290 + 26428161291.

It is an arithmetic number, because the mean of its divisors is an integer number (26428161291).

Almost surely, 2^52856322581 is an apocalyptic number.

It is an amenable number.

52856322581 is a deficient number, since it is larger than the sum of its proper divisors (1).

52856322581 is an equidigital number, since it uses as much as digits as its factorization.

52856322581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152000, while the sum is 47.

The spelling of 52856322581 in words is "fifty-two billion, eight hundred fifty-six million, three hundred twenty-two thousand, five hundred eighty-one".