12666780037664 has 12 divisors (see below), whose sum is σ = 24937723199214. Its totient is φ = 6333390018816.

The previous prime is 12666780037531. The next prime is 12666780037729. The reversal of 12666780037664 is 46673008766621.

It can be written as a sum of positive squares in only one way, i.e., 7970977717264 + 4695802320400 = 2823292^2 + 2166980^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12666780037597 and 12666780037606.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197918438057 + ... + 197918438120.

Almost surely, 2^{12666780037664} is an apocalyptic number.

It is an amenable number.

12666780037664 is a deficient number, since it is larger than the sum of its proper divisors (12270943161550).

12666780037664 is an equidigital number, since it uses as much as digits as its factorization.

12666780037664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395836876187 (or 395836876179 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 62.

The spelling of 12666780037664 in words is "twelve trillion, six hundred sixty-six billion, seven hundred eighty million, thirty-seven thousand, six hundred sixty-four".