25489938648 has 16 divisors (see below), whose sum is σ = 63724846680. Its totient is φ = 8496646208.

The previous prime is 25489938637. The next prime is 25489938671. The reversal of 25489938648 is 84683998452.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531040365 + ... + 531040412.

Almost surely, 2^25489938648 is an apocalyptic number.

It is an amenable number.

25489938648 is an abundant number, since it is smaller than the sum of its proper divisors (38234908032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25489938648 is a wasteful number, since it uses less digits than its factorization.

25489938648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062080786 (or 1062080782 counting only the distinct ones).

The product of its digits is 119439360, while the sum is 66.

The spelling of 25489938648 in words is "twenty-five billion, four hundred eighty-nine million, nine hundred thirty-eight thousand, six hundred forty-eight".