25255891515191 has 2 divisors, whose sum is σ = 25255891515192. Its totient is φ = 25255891515190.

The previous prime is 25255891515149. The next prime is 25255891515203. The reversal of 25255891515191 is 19151519855252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25255891515191 - 2²⁶ = 25255824406327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25255891515191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25255891515121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12627945757595 + 12627945757596.

It is an arithmetic number, because the mean of its divisors is an integer number (12627945757596).

Almost surely, 2^{25255891515191} is an apocalyptic number.

25255891515191 is a deficient number, since it is larger than the sum of its proper divisors (1).

25255891515191 is an equidigital number, since it uses as much as digits as its factorization.

25255891515191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100000, while the sum is 59.

The spelling of 25255891515191 in words is "twenty-five trillion, two hundred fifty-five billion, eight hundred ninety-one million, five hundred fifteen thousand, one hundred ninety-one".