25667991288 has 128 divisors (see below), whose sum is σ = 73200153600. Its totient is φ = 8328902400.

The previous prime is 25667991277. The next prime is 25667991301. The reversal of 25667991288 is 88219976652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4345345 + ... + 4351247.

It is an arithmetic number, because the mean of its divisors is an integer number (571876200).

Almost surely, 2^25667991288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25667991288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36600076800).

25667991288 is an abundant number, since it is smaller than the sum of its proper divisors (47532162312).

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

25667991288 is a wasteful number, since it uses less digits than its factorization.

25667991288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6450 (or 6440 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 25667991288 in words is "twenty-five billion, six hundred sixty-seven million, nine hundred ninety-one thousand, two hundred eighty-eight".