25434491591 has 2 divisors, whose sum is σ = 25434491592. Its totient is φ = 25434491590.

The previous prime is 25434491527. The next prime is 25434491627. The reversal of 25434491591 is 19519443452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25434491591 - 2⁶ = 25434491527 is a prime.

It is a super-2 number, since 2×25434491591² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25434491891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12717245795 + 12717245796.

It is an arithmetic number, because the mean of its divisors is an integer number (12717245796).

Almost surely, 2^25434491591 is an apocalyptic number.

25434491591 is a deficient number, since it is larger than the sum of its proper divisors (1).

25434491591 is an equidigital number, since it uses as much as digits as its factorization.

25434491591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 777600, while the sum is 47.

The spelling of 25434491591 in words is "twenty-five billion, four hundred thirty-four million, four hundred ninety-one thousand, five hundred ninety-one".