25606399999 has 2 divisors, whose sum is σ = 25606400000. Its totient is φ = 25606399998.

The previous prime is 25606399937. The next prime is 25606400041. The reversal of 25606399999 is 99999360652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25606399999 - 2¹⁵ = 25606367231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25606399909) 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, 12803199999 + 12803200000.

It is an arithmetic number, because the mean of its divisors is an integer number (12803200000).

Almost surely, 2^25606399999 is an apocalyptic number.

25606399999 is a deficient number, since it is larger than the sum of its proper divisors (1).

25606399999 is an equidigital number, since it uses as much as digits as its factorization.

25606399999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63772920, while the sum is 67.

The spelling of 25606399999 in words is "twenty-five billion, six hundred six million, three hundred ninety-nine thousand, nine hundred ninety-nine".