25656571859 has 2 divisors, whose sum is σ = 25656571860. Its totient is φ = 25656571858.

The previous prime is 25656571771. The next prime is 25656571861. The reversal of 25656571859 is 95817565652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25656571859 is a prime.

Together with 25656571861, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25656571798 and 25656571807.

It is not a weakly prime, because it can be changed into another prime (25656571159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12828285929 + 12828285930.

It is an arithmetic number, because the mean of its divisors is an integer number (12828285930).

Almost surely, 2^25656571859 is an apocalyptic number.

25656571859 is a deficient number, since it is larger than the sum of its proper divisors (1).

25656571859 is an equidigital number, since it uses as much as digits as its factorization.

25656571859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680000, while the sum is 59.

The spelling of 25656571859 in words is "twenty-five billion, six hundred fifty-six million, five hundred seventy-one thousand, eight hundred fifty-nine".