25666680 has 64 divisors (see below), whose sum is σ = 82928160. Its totient is φ = 6317568.

The previous prime is 25666679. The next prime is 25666687. The reversal of 25666680 is 8666652.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666687) 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, 6667 + ... + 9786.

Almost surely, 2^25666680 is an apocalyptic number.

25666680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25666680 is an abundant number, since it is smaller than the sum of its proper divisors (57261480).

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

25666680 is a wasteful number, since it uses less digits than its factorization.

25666680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16480 (or 16476 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 25666680 is about 5066.2293670934. The cubic root of 25666680 is about 294.9781847317.

The spelling of 25666680 in words is "twenty-five million, six hundred sixty-six thousand, six hundred eighty".