25991239992 has 16 divisors (see below), whose sum is σ = 64978100040. Its totient is φ = 8663746656.

The previous prime is 25991239979. The next prime is 25991240017. The reversal of 25991239992 is 29993219952.

It is a congruent number.

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, 541484143 + ... + 541484190.

Almost surely, 2^25991239992 is an apocalyptic number.

It is an amenable number.

25991239992 is an abundant number, since it is smaller than the sum of its proper divisors (38986860048).

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

25991239992 is a wasteful number, since it uses less digits than its factorization.

25991239992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082968342 (or 1082968338 counting only the distinct ones).

The product of its digits is 7085880, while the sum is 60.

The spelling of 25991239992 in words is "twenty-five billion, nine hundred ninety-one million, two hundred thirty-nine thousand, nine hundred ninety-two".