12666561066676 has 24 divisors (see below), whose sum is σ = 24181805539584. Its totient is φ = 5757482767680.

The previous prime is 12666561066557. The next prime is 12666561066737. The reversal of 12666561066676 is 67666016566621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4937176 + ... + 7050448.

It is an arithmetic number, because the mean of its divisors is an integer number (1007575230816).

Almost surely, 2^{12666561066676} is an apocalyptic number.

It is an amenable number.

12666561066676 is a deficient number, since it is larger than the sum of its proper divisors (11515244472908).

12666561066676 is a wasteful number, since it uses less digits than its factorization.

12666561066676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249511 (or 2249509 counting only the distinct ones).

The product of its (nonzero) digits is 117573120, while the sum is 64.

Subtracting 12666561066676 from its reverse (67666016566621), we obtain a palindrome (54999455499945).

It can be divided in two parts, 1266656 and 1066676, that added together give a palindrome (2333332).

The spelling of 12666561066676 in words is "twelve trillion, six hundred sixty-six billion, five hundred sixty-one million, sixty-six thousand, six hundred seventy-six".