12643321833 has 14 divisors (see below), whose sum is σ = 18956312154. Its totient is φ = 8428880736.

The previous prime is 12643321813. The next prime is 12643321843. The reversal of 12643321833 is 33812334621.

12643321833 is a `hidden beast` number, since 1 + 2 + 6 + 433 + 218 + 3 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7862014224 + 4781307609 = 88668^2 + 69147^2 .

It is not a de Polignac number, because 12643321833 - 2¹² = 12643317737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12643321813) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 8670960 + ... + 8672417.

Almost surely, 2^12643321833 is an apocalyptic number.

It is an amenable number.

12643321833 is a deficient number, since it is larger than the sum of its proper divisors (6312990321).

12643321833 is an frugal number, since it uses more digits than its factorization.

12643321833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17343395 (or 17343380 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The spelling of 12643321833 in words is "twelve billion, six hundred forty-three million, three hundred twenty-one thousand, eight hundred thirty-three".