25252505549 has 2 divisors, whose sum is σ = 25252505550. Its totient is φ = 25252505548.

The previous prime is 25252505521. The next prime is 25252505569. The reversal of 25252505549 is 94550525252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23648903524 + 1603602025 = 153782^2 + 40045^2 .

It is a cyclic number.

It is not a de Polignac number, because 25252505549 - 2⁸ = 25252505293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25252505569) 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, 12626252774 + 12626252775.

It is an arithmetic number, because the mean of its divisors is an integer number (12626252775).

Almost surely, 2^25252505549 is an apocalyptic number.

It is an amenable number.

25252505549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25252505549 is an equidigital number, since it uses as much as digits as its factorization.

25252505549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 25252505549 in words is "twenty-five billion, two hundred fifty-two million, five hundred five thousand, five hundred forty-nine".