25911797449 has 2 divisors, whose sum is σ = 25911797450. Its totient is φ = 25911797448.

The previous prime is 25911797437. The next prime is 25911797459. The reversal of 25911797449 is 94479711952.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19504915600 + 6406881849 = 139660^2 + 80043^2 .

It is a cyclic number.

It is not a de Polignac number, because 25911797449 - 2¹³ = 25911789257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25911797393 and 25911797402.

It is not a weakly prime, because it can be changed into another prime (25911797459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12955898724 + 12955898725.

It is an arithmetic number, because the mean of its divisors is an integer number (12955898725).

Almost surely, 2^25911797449 is an apocalyptic number.

It is an amenable number.

25911797449 is a deficient number, since it is larger than the sum of its proper divisors (1).

25911797449 is an equidigital number, since it uses as much as digits as its factorization.

25911797449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 58.

The spelling of 25911797449 in words is "twenty-five billion, nine hundred eleven million, seven hundred ninety-seven thousand, four hundred forty-nine".