25097879449 has 2 divisors, whose sum is σ = 25097879450. Its totient is φ = 25097879448.

The previous prime is 25097879431. The next prime is 25097879453. The reversal of 25097879449 is 94497879052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24484425625 + 613453824 = 156475^2 + 24768^2 .

It is a cyclic number.

It is not a de Polignac number, because 25097879449 - 2⁷ = 25097879321 is a prime.

It is not a weakly prime, because it can be changed into another prime (25097879419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12548939724 + 12548939725.

It is an arithmetic number, because the mean of its divisors is an integer number (12548939725).

Almost surely, 2^25097879449 is an apocalyptic number.

It is an amenable number.

25097879449 is a deficient number, since it is larger than the sum of its proper divisors (1).

25097879449 is an equidigital number, since it uses as much as digits as its factorization.

25097879449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 25097879449 in words is "twenty-five billion, ninety-seven million, eight hundred seventy-nine thousand, four hundred forty-nine".