25343605849 has 2 divisors, whose sum is σ = 25343605850. Its totient is φ = 25343605848.

The previous prime is 25343605843. The next prime is 25343605871. The reversal of 25343605849 is 94850634352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20658887824 + 4684718025 = 143732^2 + 68445^2 .

It is a cyclic number.

It is not a de Polignac number, because 25343605849 - 2³ = 25343605841 is a prime.

It is not a weakly prime, because it can be changed into another prime (25343605841) 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, 12671802924 + 12671802925.

It is an arithmetic number, because the mean of its divisors is an integer number (12671802925).

Almost surely, 2^25343605849 is an apocalyptic number.

It is an amenable number.

25343605849 is a deficient number, since it is larger than the sum of its proper divisors (1).

25343605849 is an equidigital number, since it uses as much as digits as its factorization.

25343605849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 25343605849 in words is "twenty-five billion, three hundred forty-three million, six hundred five thousand, eight hundred forty-nine".