25556778575899 has 2 divisors, whose sum is σ = 25556778575900. Its totient is φ = 25556778575898.

The previous prime is 25556778575803. The next prime is 25556778575941. The reversal of 25556778575899 is 99857587765552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25556778575899 - 2⁹ = 25556778575387 is a prime.

It is not a weakly prime, because it can be changed into another prime (25556778575299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12778389287949 + 12778389287950.

It is an arithmetic number, because the mean of its divisors is an integer number (12778389287950).

Almost surely, 2^{25556778575899} is an apocalyptic number.

25556778575899 is a deficient number, since it is larger than the sum of its proper divisors (1).

25556778575899 is an equidigital number, since it uses as much as digits as its factorization.

25556778575899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66679200000, while the sum is 88.

The spelling of 25556778575899 in words is "twenty-five trillion, five hundred fifty-six billion, seven hundred seventy-eight million, five hundred seventy-five thousand, eight hundred ninety-nine".