25666668 has 54 divisors (see below), whose sum is σ = 68948516. Its totient is φ = 8049024.

The previous prime is 25666661. The next prime is 25666679. The reversal of 25666668 is 86666652.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (25666661) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9171 + ... + 11637.

Almost surely, 2^25666668 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 25666668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34474258).

25666668 is an abundant number, since it is smaller than the sum of its proper divisors (43281848).

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

25666668 is a wasteful number, since it uses less digits than its factorization.

25666668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511 (or 2489 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 25666668 is about 5066.2281827806. The cubic root of 25666668 is about 294.9781387611.

The spelling of 25666668 in words is "twenty-five million, six hundred sixty-six thousand, six hundred sixty-eight".