25805025791 has 4 divisors (see below), whose sum is σ = 25805383032. Its totient is φ = 25804668552.

The previous prime is 25805025737. The next prime is 25805025823. The reversal of 25805025791 is 19752050852.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25805025791 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 (25805025391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27845 + ... + 228878.

It is an arithmetic number, because the mean of its divisors is an integer number (6451345758).

Almost surely, 2^25805025791 is an apocalyptic number.

25805025791 is a deficient number, since it is larger than the sum of its proper divisors (357241).

25805025791 is a wasteful number, since it uses less digits than its factorization.

25805025791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357240.

The product of its (nonzero) digits is 252000, while the sum is 44.

The spelling of 25805025791 in words is "twenty-five billion, eight hundred five million, twenty-five thousand, seven hundred ninety-one".