25560852078781 has 2 divisors, whose sum is σ = 25560852078782. Its totient is φ = 25560852078780.

The previous prime is 25560852078757. The next prime is 25560852078821. The reversal of 25560852078781 is 18787025806552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25500136654756 + 60715424025 = 5049766^2 + 246405^2 .

It is a cyclic number.

It is not a de Polignac number, because 25560852078781 - 2¹¹ = 25560852076733 is a prime.

It is a super-2 number, since 2×25560852078781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25560852078481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12780426039390 + 12780426039391.

It is an arithmetic number, because the mean of its divisors is an integer number (12780426039391).

Almost surely, 2^{25560852078781} is an apocalyptic number.

It is an amenable number.

25560852078781 is a deficient number, since it is larger than the sum of its proper divisors (1).

25560852078781 is an equidigital number, since it uses as much as digits as its factorization.

25560852078781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264000, while the sum is 64.

The spelling of 25560852078781 in words is "twenty-five trillion, five hundred sixty billion, eight hundred fifty-two million, seventy-eight thousand, seven hundred eighty-one".