25525252802809 has 2 divisors, whose sum is σ = 25525252802810. Its totient is φ = 25525252802808.

The previous prime is 25525252802773. The next prime is 25525252802821. The reversal of 25525252802809 is 90820825252552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25486372850409 + 38879952400 = 5048403^2 + 197180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25525252802809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25525252802809.

It is not a weakly prime, because it can be changed into another prime (25525252802869) 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, 12762626401404 + 12762626401405.

It is an arithmetic number, because the mean of its divisors is an integer number (12762626401405).

Almost surely, 2^{25525252802809} is an apocalyptic number.

It is an amenable number.

25525252802809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25525252802809 is an equidigital number, since it uses as much as digits as its factorization.

25525252802809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520000, while the sum is 55.

The spelling of 25525252802809 in words is "twenty-five trillion, five hundred twenty-five billion, two hundred fifty-two million, eight hundred two thousand, eight hundred nine".