25528872709 has 2 divisors, whose sum is σ = 25528872710. Its totient is φ = 25528872708.

The previous prime is 25528872661. The next prime is 25528872731. The reversal of 25528872709 is 90727882552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22403503684 + 3125369025 = 149678^2 + 55905^2 .

It is a cyclic number.

It is not a de Polignac number, because 25528872709 - 2²⁷ = 25394654981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25528872709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25528872799) 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, 12764436354 + 12764436355.

It is an arithmetic number, because the mean of its divisors is an integer number (12764436355).

Almost surely, 2^25528872709 is an apocalyptic number.

It is an amenable number.

25528872709 is a deficient number, since it is larger than the sum of its proper divisors (1).

25528872709 is an equidigital number, since it uses as much as digits as its factorization.

25528872709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5644800, while the sum is 55.

The spelling of 25528872709 in words is "twenty-five billion, five hundred twenty-eight million, eight hundred seventy-two thousand, seven hundred nine".