25881049236 has 48 divisors (see below), whose sum is σ = 71242465280. Its totient is φ = 7156049760.

The previous prime is 25881049231. The next prime is 25881049273. The reversal of 25881049236 is 63294018852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25881049231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4966876 + ... + 4972083.

Almost surely, 2^25881049236 is an apocalyptic number.

It is an amenable number.

25881049236 is an abundant number, since it is smaller than the sum of its proper divisors (45361416044).

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

25881049236 is a wasteful number, since it uses less digits than its factorization.

25881049236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9939004 (or 9939002 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 25881049236 in words is "twenty-five billion, eight hundred eighty-one million, forty-nine thousand, two hundred thirty-six".