25259256689 has 2 divisors, whose sum is σ = 25259256690. Its totient is φ = 25259256688.

The previous prime is 25259256667. The next prime is 25259256721. The reversal of 25259256689 is 98665295252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24404688400 + 854568289 = 156220^2 + 29233^2 .

It is a cyclic number.

It is not a de Polignac number, because 25259256689 - 2²⁰ = 25258208113 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25259253689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12629628344 + 12629628345.

It is an arithmetic number, because the mean of its divisors is an integer number (12629628345).

Almost surely, 2^25259256689 is an apocalyptic number.

It is an amenable number.

25259256689 is a deficient number, since it is larger than the sum of its proper divisors (1).

25259256689 is an equidigital number, since it uses as much as digits as its factorization.

25259256689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328000, while the sum is 59.

The spelling of 25259256689 in words is "twenty-five billion, two hundred fifty-nine million, two hundred fifty-six thousand, six hundred eighty-nine".