25197590549 has 2 divisors, whose sum is σ = 25197590550. Its totient is φ = 25197590548.

The previous prime is 25197590521. The next prime is 25197590581. The reversal of 25197590549 is 94509579152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23475755524 + 1721835025 = 153218^2 + 41495^2 .

It is a cyclic number.

It is not a de Polignac number, because 25197590549 - 2³² = 20902623253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25197590494 and 25197590503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25197590749) 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, 12598795274 + 12598795275.

It is an arithmetic number, because the mean of its divisors is an integer number (12598795275).

Almost surely, 2^25197590549 is an apocalyptic number.

It is an amenable number.

25197590549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25197590549 is an equidigital number, since it uses as much as digits as its factorization.

25197590549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5103000, while the sum is 56.

The spelling of 25197590549 in words is "twenty-five billion, one hundred ninety-seven million, five hundred ninety thousand, five hundred forty-nine".