12356672666 has 32 divisors (see below), whose sum is σ = 21352902480. Its totient is φ = 5312249856.

The previous prime is 12356672641. The next prime is 12356672681. The reversal of 12356672666 is 66627665321.

It can be written as a sum of positive squares in 8 ways, for example, as 2315630641 + 10041042025 = 48121^2 + 100205^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101231 + ... + 186978.

Almost surely, 2^12356672666 is an apocalyptic number.

12356672666 is a deficient number, since it is larger than the sum of its proper divisors (8996229814).

12356672666 is a wasteful number, since it uses less digits than its factorization.

12356672666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288338.

The product of its digits is 3265920, while the sum is 50.

The spelling of 12356672666 in words is "twelve billion, three hundred fifty-six million, six hundred seventy-two thousand, six hundred sixty-six".