12666788216804 has 12 divisors (see below), whose sum is σ = 22166906901804. Its totient is φ = 6333386244864.

The previous prime is 12666788216777. The next prime is 12666788216839. The reversal of 12666788216804 is 40861288766621.

It can be written as a sum of positive squares in 2 ways, for example, as 6679909040704 + 5986879176100 = 2584552^2 + 2446810^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3120992 + ... + 5922344.

It is an arithmetic number, because the mean of its divisors is an integer number (1847242241817).

Almost surely, 2^{12666788216804} is an apocalyptic number.

It is an amenable number.

12666788216804 is a deficient number, since it is larger than the sum of its proper divisors (9500118685000).

12666788216804 is a wasteful number, since it uses less digits than its factorization.

12666788216804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931774 (or 3931772 counting only the distinct ones).

The product of its (nonzero) digits is 74317824, while the sum is 65.

The spelling of 12666788216804 in words is "twelve trillion, six hundred sixty-six billion, seven hundred eighty-eight million, two hundred sixteen thousand, eight hundred four".