25813884749 has 2 divisors, whose sum is σ = 25813884750. Its totient is φ = 25813884748.

The previous prime is 25813884727. The next prime is 25813884917. The reversal of 25813884749 is 94748831852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24108772900 + 1705111849 = 155270^2 + 41293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25813884749 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25813881749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12906942374 + 12906942375.

It is an arithmetic number, because the mean of its divisors is an integer number (12906942375).

Almost surely, 2^25813884749 is an apocalyptic number.

It is an amenable number.

25813884749 is a deficient number, since it is larger than the sum of its proper divisors (1).

25813884749 is an equidigital number, since it uses as much as digits as its factorization.

25813884749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15482880, while the sum is 59.

The spelling of 25813884749 in words is "twenty-five billion, eight hundred thirteen million, eight hundred eighty-four thousand, seven hundred forty-nine".