666212 has 12 divisors (see below), whose sum is σ = 1174656. Its totient is φ = 330600.

The previous prime is 666203. The next prime is 666229. The reversal of 666212 is 212666.

It is a nialpdrome in base 7.

It is an unprimeable number.

666212 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, 53 + ... + 1155.

It is an arithmetic number, because the mean of its divisors is an integer number (97888).

2⁶⁶⁶²¹² is an apocalyptic number.

It is an amenable number.

666212 is a deficient number, since it is larger than the sum of its proper divisors (508444).

666212 is a wasteful number, since it uses less digits than its factorization.

666212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258 (or 1256 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 666212 is about 816.2181081059. The cubic root of 666212 is about 87.3381825613.

Adding to 666212 its reverse (212666), we get a palindrome (878878).

It can be divided in two parts, 666 and 212, that added together give a palindrome (878).

The spelling of 666212 in words is "six hundred sixty-six thousand, two hundred twelve".