25386591991 has 2 divisors, whose sum is σ = 25386591992. Its totient is φ = 25386591990.

The previous prime is 25386591973. The next prime is 25386592043. The reversal of 25386591991 is 19919568352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25386591991 - 2⁷ = 25386591863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25386591911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12693295995 + 12693295996.

It is an arithmetic number, because the mean of its divisors is an integer number (12693295996).

Almost surely, 2^25386591991 is an apocalyptic number.

25386591991 is a deficient number, since it is larger than the sum of its proper divisors (1).

25386591991 is an equidigital number, since it uses as much as digits as its factorization.

25386591991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5248800, while the sum is 58.

The spelling of 25386591991 in words is "twenty-five billion, three hundred eighty-six million, five hundred ninety-one thousand, nine hundred ninety-one".