25427332391 has 2 divisors, whose sum is σ = 25427332392. Its totient is φ = 25427332390.

The previous prime is 25427332387. The next prime is 25427332397. The reversal of 25427332391 is 19323372452.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25427332391 - 2² = 25427332387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25427332397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12713666195 + 12713666196.

It is an arithmetic number, because the mean of its divisors is an integer number (12713666196).

Almost surely, 2^25427332391 is an apocalyptic number.

25427332391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25427332391 is an equidigital number, since it uses as much as digits as its factorization.

25427332391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 41.

The spelling of 25427332391 in words is "twenty-five billion, four hundred twenty-seven million, three hundred thirty-two thousand, three hundred ninety-one".