Subtracting from 66216 its reverse (61266), we obtain a triangular number (4950 = T99).
It is a nude number because it is divisible by every one of its digits.
It is an unprimeable number.
66216 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
266216 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 66216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
66216 is a wasteful number, since it uses less digits than its factorization.
66216 is an odious number, because the sum of its binary digits is odd.
The square root of 66216 is about 257.3246976098. The cubic root of 66216 is about 40.4564384541.
The spelling of 66216 in words is "sixty-six thousand, two hundred sixteen".