66212 has 6 divisors (see below), whose sum is σ = 115878.
Its totient is φ = 33104.
The previous prime is 66191. The next prime is 66221. The reversal of 66212 is 21266.
Adding to 66212 its reverse (21266), we get a palindrome (87478).
It can be written as a sum of positive squares in only one way, i.e., 65536 + 676 = 256^2 + 26^2
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66212.
It is an unprimeable number.
66212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8273 + ... + 8280.
It is an arithmetic number, because the mean of its divisors is an integer number (19313).
266212 is an apocalyptic number.
It is an amenable number.
66212 is a deficient number, since it is larger than the sum of its proper divisors (49666).
66212 is a wasteful number, since it uses less digits than its factorization.
66212 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 16557 (or 16555 counting only the distinct ones).
The product of its digits is 144, while the sum is 17.
The square root of 66212 is about 257.3169252109.
The cubic root of 66212 is about 40.4556238020.
The spelling of 66212 in words is "sixty-six thousand, two hundred twelve".