25971984191 has 2 divisors, whose sum is σ = 25971984192. Its totient is φ = 25971984190.

The previous prime is 25971984131. The next prime is 25971984217. The reversal of 25971984191 is 19148917952.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25971984191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25971984131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12985992095 + 12985992096.

It is an arithmetic number, because the mean of its divisors is an integer number (12985992096).

Almost surely, 2^25971984191 is an apocalyptic number.

25971984191 is a deficient number, since it is larger than the sum of its proper divisors (1).

25971984191 is an equidigital number, since it uses as much as digits as its factorization.

25971984191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 56.

The spelling of 25971984191 in words is "twenty-five billion, nine hundred seventy-one million, nine hundred eighty-four thousand, one hundred ninety-one".