25560661199 has 2 divisors, whose sum is σ = 25560661200. Its totient is φ = 25560661198.

The previous prime is 25560661171. The next prime is 25560661207. The reversal of 25560661199 is 99116606552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25560661199 - 2⁸ = 25560660943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25560661129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12780330599 + 12780330600.

It is an arithmetic number, because the mean of its divisors is an integer number (12780330600).

Almost surely, 2^25560661199 is an apocalyptic number.

25560661199 is a deficient number, since it is larger than the sum of its proper divisors (1).

25560661199 is an equidigital number, since it uses as much as digits as its factorization.

25560661199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 50.

The spelling of 25560661199 in words is "twenty-five billion, five hundred sixty million, six hundred sixty-one thousand, one hundred ninety-nine".