25649508866 has 8 divisors (see below), whose sum is σ = 38478327804. Its totient is φ = 12823399600.

The previous prime is 25649508821. The next prime is 25649508877. The reversal of 25649508866 is 66880594652.

25649508866 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 25481417641 + 168091225 = 159629^2 + 12965^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 653585 + ... + 691716.

Almost surely, 2^25649508866 is an apocalyptic number.

25649508866 is a deficient number, since it is larger than the sum of its proper divisors (12828818938).

25649508866 is a wasteful number, since it uses less digits than its factorization.

25649508866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354836.

The product of its (nonzero) digits is 24883200, while the sum is 59.

The spelling of 25649508866 in words is "twenty-five billion, six hundred forty-nine million, five hundred eight thousand, eight hundred sixty-six".