66680 has 16 divisors (see below), whose sum is σ = 150120. Its totient is φ = 26656.

The previous prime is 66653. The next prime is 66683. The reversal of 66680 is 8666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66683) by changing a digit.

66680 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 794 + ... + 873.

2⁶⁶⁶⁸⁰ is an apocalyptic number.

It is an amenable number.

66680 is an abundant number, since it is smaller than the sum of its proper divisors (83440).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75060).

66680 is a wasteful number, since it uses less digits than its factorization.

66680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678 (or 1674 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 66680 is about 258.2247083453. The cubic root of 66680 is about 40.5507163245.

The spelling of 66680 in words is "sixty-six thousand, six hundred eighty".