25435321591 has 2 divisors, whose sum is σ = 25435321592. Its totient is φ = 25435321590.

The previous prime is 25435321573. The next prime is 25435321607. The reversal of 25435321591 is 19512353452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25435321591 - 2⁵ = 25435321559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25435321291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12717660795 + 12717660796.

It is an arithmetic number, because the mean of its divisors is an integer number (12717660796).

Almost surely, 2^25435321591 is an apocalyptic number.

25435321591 is a deficient number, since it is larger than the sum of its proper divisors (1).

25435321591 is an equidigital number, since it uses as much as digits as its factorization.

25435321591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 40.

The spelling of 25435321591 in words is "twenty-five billion, four hundred thirty-five million, three hundred twenty-one thousand, five hundred ninety-one".