25565256589 has 2 divisors, whose sum is σ = 25565256590. Its totient is φ = 25565256588.

The previous prime is 25565256529. The next prime is 25565256643. The reversal of 25565256589 is 98565256552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22828188100 + 2737068489 = 151090^2 + 52317^2 .

It is a cyclic number.

It is not a de Polignac number, because 25565256589 - 2¹⁵ = 25565223821 is a prime.

It is a super-2 number, since 2×25565256589² (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 (25565256529) 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, 12782628294 + 12782628295.

It is an arithmetic number, because the mean of its divisors is an integer number (12782628295).

Almost surely, 2^25565256589 is an apocalyptic number.

It is an amenable number.

25565256589 is a deficient number, since it is larger than the sum of its proper divisors (1).

25565256589 is an equidigital number, since it uses as much as digits as its factorization.

25565256589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400000, while the sum is 58.

The spelling of 25565256589 in words is "twenty-five billion, five hundred sixty-five million, two hundred fifty-six thousand, five hundred eighty-nine".