25431889388 has 12 divisors (see below), whose sum is σ = 44507464680. Its totient is φ = 12715470912.

The previous prime is 25431889349. The next prime is 25431889391. The reversal of 25431889388 is 88398813452.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20420 + ... + 226452.

It is an arithmetic number, because the mean of its divisors is an integer number (3708955390).

Almost surely, 2^25431889388 is an apocalyptic number.

It is an amenable number.

25431889388 is a deficient number, since it is larger than the sum of its proper divisors (19075575292).

25431889388 is a wasteful number, since it uses less digits than its factorization.

25431889388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236896 (or 236894 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 59.

The spelling of 25431889388 in words is "twenty-five billion, four hundred thirty-one million, eight hundred eighty-nine thousand, three hundred eighty-eight".