25275126449 has 2 divisors, whose sum is σ = 25275126450. Its totient is φ = 25275126448.

The previous prime is 25275126353. The next prime is 25275126451. The reversal of 25275126449 is 94462157252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13796146849 + 11478979600 = 117457^2 + 107140^2 .

It is a cyclic number.

It is not a de Polignac number, because 25275126449 - 2²⁸ = 25006690993 is a prime.

It is a Sophie Germain prime.

Together with 25275126451, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25275626449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12637563224 + 12637563225.

It is an arithmetic number, because the mean of its divisors is an integer number (12637563225).

Almost surely, 2^25275126449 is an apocalyptic number.

It is an amenable number.

25275126449 is a deficient number, since it is larger than the sum of its proper divisors (1).

25275126449 is an equidigital number, since it uses as much as digits as its factorization.

25275126449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 47.

The spelling of 25275126449 in words is "twenty-five billion, two hundred seventy-five million, one hundred twenty-six thousand, four hundred forty-nine".