25185009191 has 2 divisors, whose sum is σ = 25185009192. Its totient is φ = 25185009190.

The previous prime is 25185009121. The next prime is 25185009253. The reversal of 25185009191 is 19190058152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25185009191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25185009121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12592504595 + 12592504596.

It is an arithmetic number, because the mean of its divisors is an integer number (12592504596).

Almost surely, 2^25185009191 is an apocalyptic number.

25185009191 is a deficient number, since it is larger than the sum of its proper divisors (1).

25185009191 is an equidigital number, since it uses as much as digits as its factorization.

25185009191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 41.

The spelling of 25185009191 in words is "twenty-five billion, one hundred eighty-five million, nine thousand, one hundred ninety-one".