12666819738 has 32 divisors (see below), whose sum is σ = 25745493312. Its totient is φ = 4154054400.

The previous prime is 12666819733. The next prime is 12666819749. The reversal of 12666819738 is 83791866621.

It is not an unprimeable number, because it can be changed into a prime (12666819733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67248 + ... + 172788.

It is an arithmetic number, because the mean of its divisors is an integer number (804546666).

Almost surely, 2^12666819738 is an apocalyptic number.

12666819738 is an abundant number, since it is smaller than the sum of its proper divisors (13078673574).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12666819738 is a wasteful number, since it uses less digits than its factorization.

12666819738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105870.

The product of its digits is 5225472, while the sum is 57.

The spelling of 12666819738 in words is "twelve billion, six hundred sixty-six million, eight hundred nineteen thousand, seven hundred thirty-eight".