25659849791 has 12 divisors (see below), whose sum is σ = 25980249792. Its totient is φ = 25343349504.

The previous prime is 25659849781. The next prime is 25659849823. The reversal of 25659849791 is 19794895652.

It is a de Polignac number, because none of the positive numbers 2^k-25659849791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25659849781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14074706 + ... + 14076528.

It is an arithmetic number, because the mean of its divisors is an integer number (2165020816).

Almost surely, 2^25659849791 is an apocalyptic number.

25659849791 is a deficient number, since it is larger than the sum of its proper divisors (320400001).

25659849791 is an equidigital number, since it uses as much as digits as its factorization.

25659849791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3778 (or 3689 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 65.

The spelling of 25659849791 in words is "twenty-five billion, six hundred fifty-nine million, eight hundred forty-nine thousand, seven hundred ninety-one".