25449133813 has 2 divisors, whose sum is σ = 25449133814. Its totient is φ = 25449133812.

The previous prime is 25449133811. The next prime is 25449133907. The reversal of 25449133813 is 31833194452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25312173604 + 136960209 = 159098^2 + 11703^2 .

It is a cyclic number.

It is not a de Polignac number, because 25449133813 - 2¹ = 25449133811 is a prime.

Together with 25449133811, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25449133813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25449133811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12724566906 + 12724566907.

It is an arithmetic number, because the mean of its divisors is an integer number (12724566907).

Almost surely, 2^25449133813 is an apocalyptic number.

It is an amenable number.

25449133813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25449133813 is an equidigital number, since it uses as much as digits as its factorization.

25449133813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 43.

The spelling of 25449133813 in words is "twenty-five billion, four hundred forty-nine million, one hundred thirty-three thousand, eight hundred thirteen".