666443344666 has 16 divisors (see below), whose sum is σ = 1090687742208. Its totient is φ = 302888768800.

The previous prime is 666443344663. The next prime is 666443344687.

666443344666 is nontrivially palindromic in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 666443344666.

It is not an unprimeable number, because it can be changed into a prime (666443344663) 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, 1830595 + ... + 2164246.

It is an arithmetic number, because the mean of its divisors is an integer number (68167983888).

Almost surely, 2^666443344666 is an apocalyptic number.

666443344666 is a deficient number, since it is larger than the sum of its proper divisors (424244397542).

666443344666 is a wasteful number, since it uses less digits than its factorization.

666443344666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002437.

The product of its digits is 107495424, while the sum is 58.

The spelling of 666443344666 in words is "six hundred sixty-six billion, four hundred forty-three million, three hundred forty-four thousand, six hundred sixty-six".