12966666 has 16 divisors (see below), whose sum is σ = 26373600. Its totient is φ = 4248848.

The previous prime is 12966661. The next prime is 12966703. The reversal of 12966666 is 66666921.

12966666 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

12966666 is a modest number, since divided by 6666 gives 1296 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12966661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17961 + ... + 18668.

It is an arithmetic number, because the mean of its divisors is an integer number (1648350).

Almost surely, 2^12966666 is an apocalyptic number.

12966666 is an abundant number, since it is smaller than the sum of its proper divisors (13406934).

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

12966666 is a wasteful number, since it uses less digits than its factorization.

12966666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36693.

The product of its digits is 139968, while the sum is 42.

The square root of 12966666 is about 3600.9257143129. The cubic root of 12966666 is about 234.9323239558.

It can be divided in two parts, 129 and 66666, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 12966666 in words is "twelve million, nine hundred sixty-six thousand, six hundred sixty-six".