25420343591 has 2 divisors, whose sum is σ = 25420343592. Its totient is φ = 25420343590.

The previous prime is 25420343537. The next prime is 25420343633. The reversal of 25420343591 is 19534302452.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25420343591 - 2¹⁰ = 25420342567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25420343891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12710171795 + 12710171796.

It is an arithmetic number, because the mean of its divisors is an integer number (12710171796).

Almost surely, 2^25420343591 is an apocalyptic number.

25420343591 is a deficient number, since it is larger than the sum of its proper divisors (1).

25420343591 is an equidigital number, since it uses as much as digits as its factorization.

25420343591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 25420343591 in words is "twenty-five billion, four hundred twenty million, three hundred forty-three thousand, five hundred ninety-one".