25389093263549 has 2 divisors, whose sum is σ = 25389093263550. Its totient is φ = 25389093263548.

The previous prime is 25389093263503. The next prime is 25389093263551. The reversal of 25389093263549 is 94536239098352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25259570292100 + 129522971449 = 5025890^2 + 359893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25389093263549 is a prime.

Together with 25389093263551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25389093260549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12694546631774 + 12694546631775.

It is an arithmetic number, because the mean of its divisors is an integer number (12694546631775).

Almost surely, 2^{25389093263549} is an apocalyptic number.

It is an amenable number.

25389093263549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25389093263549 is an equidigital number, since it uses as much as digits as its factorization.

25389093263549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 377913600, while the sum is 68.

The spelling of 25389093263549 in words is "twenty-five trillion, three hundred eighty-nine billion, ninety-three million, two hundred sixty-three thousand, five hundred forty-nine".