25559244761 has 2 divisors, whose sum is σ = 25559244762. Its totient is φ = 25559244760.

The previous prime is 25559244749. The next prime is 25559244797. The reversal of 25559244761 is 16744295552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18844425625 + 6714819136 = 137275^2 + 81944^2 .

It is a cyclic number.

It is not a de Polignac number, because 25559244761 - 2¹⁰ = 25559243737 is a prime.

It is not a weakly prime, because it can be changed into another prime (25559247761) 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, 12779622380 + 12779622381.

It is an arithmetic number, because the mean of its divisors is an integer number (12779622381).

Almost surely, 2^25559244761 is an apocalyptic number.

It is an amenable number.

25559244761 is a deficient number, since it is larger than the sum of its proper divisors (1).

25559244761 is an equidigital number, since it uses as much as digits as its factorization.

25559244761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024000, while the sum is 50.

The spelling of 25559244761 in words is "twenty-five billion, five hundred fifty-nine million, two hundred forty-four thousand, seven hundred sixty-one".