25805431894 has 64 divisors (see below), whose sum is σ = 47632354560. Its totient is φ = 10332472320.

The previous prime is 25805431867. The next prime is 25805431901. The reversal of 25805431894 is 49813450852.

25805431894 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 567922 + ... + 611674.

It is an arithmetic number, because the mean of its divisors is an integer number (744255540).

Almost surely, 2^25805431894 is an apocalyptic number.

25805431894 is a deficient number, since it is larger than the sum of its proper divisors (21826922666).

25805431894 is a wasteful number, since it uses less digits than its factorization.

25805431894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43885.

The product of its (nonzero) digits is 1382400, while the sum is 49.

The spelling of 25805431894 in words is "twenty-five billion, eight hundred five million, four hundred thirty-one thousand, eight hundred ninety-four".