666012 has 12 divisors (see below), whose sum is σ = 1554056. Its totient is φ = 222000.

The previous prime is 665993. The next prime is 666013. The reversal of 666012 is 210666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 666012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666013) by changing a digit.

666012 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, 27739 + ... + 27762.

2⁶⁶⁶⁰¹² is an apocalyptic number.

It is an amenable number.

666012 is an abundant number, since it is smaller than the sum of its proper divisors (888044).

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

666012 is a wasteful number, since it uses less digits than its factorization.

666012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55508 (or 55506 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 666012 is about 816.0955826372. The cubic root of 666012 is about 87.3294419078.

Adding to 666012 its reverse (210666), we get a palindrome (876678).

The spelling of 666012 in words is "six hundred sixty-six thousand, twelve".