25256772689 has 2 divisors, whose sum is σ = 25256772690. Its totient is φ = 25256772688.

The previous prime is 25256772679. The next prime is 25256772743. The reversal of 25256772689 is 98627765252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19103939089 + 6152833600 = 138217^2 + 78440^2 .

It is a cyclic number.

It is not a de Polignac number, because 25256772689 - 2⁸ = 25256772433 is a prime.

It is not a weakly prime, because it can be changed into another prime (25256772659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12628386344 + 12628386345.

It is an arithmetic number, because the mean of its divisors is an integer number (12628386345).

Almost surely, 2^25256772689 is an apocalyptic number.

It is an amenable number.

25256772689 is a deficient number, since it is larger than the sum of its proper divisors (1).

25256772689 is an equidigital number, since it uses as much as digits as its factorization.

25256772689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25401600, while the sum is 59.

The spelling of 25256772689 in words is "twenty-five billion, two hundred fifty-six million, seven hundred seventy-two thousand, six hundred eighty-nine".