25583137861 has 2 divisors, whose sum is σ = 25583137862. Its totient is φ = 25583137860.

The previous prime is 25583137829. The next prime is 25583137919. The reversal of 25583137861 is 16873138552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24481296225 + 1101841636 = 156465^2 + 33194^2 .

It is a cyclic number.

It is not a de Polignac number, because 25583137861 - 2⁵ = 25583137829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25583137561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12791568930 + 12791568931.

It is an arithmetic number, because the mean of its divisors is an integer number (12791568931).

Almost surely, 2^25583137861 is an apocalyptic number.

It is an amenable number.

25583137861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25583137861 is an equidigital number, since it uses as much as digits as its factorization.

25583137861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 49.

The spelling of 25583137861 in words is "twenty-five billion, five hundred eighty-three million, one hundred thirty-seven thousand, eight hundred sixty-one".