666812 has 6 divisors (see below), whose sum is σ = 1166928. Its totient is φ = 333404.

The previous prime is 666811. The next prime is 666821. The reversal of 666812 is 218666.

666812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83348 + ... + 83355.

It is an arithmetic number, because the mean of its divisors is an integer number (194488).

2⁶⁶⁶⁸¹² is an apocalyptic number.

It is an amenable number.

666812 is a deficient number, since it is larger than the sum of its proper divisors (500116).

666812 is a wasteful number, since it uses less digits than its factorization.

666812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166707 (or 166705 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 666812 is about 816.5855742052. The cubic root of 666812 is about 87.3643940304.

The spelling of 666812 in words is "six hundred sixty-six thousand, eight hundred twelve".