12643954033 has 4 divisors (see below), whose sum is σ = 12644242660. Its totient is φ = 12643665408.

The previous prime is 12643954027. The next prime is 12643954061. The reversal of 12643954033 is 33045934621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2833645824 + 9810308209 = 53232^2 + 99047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12643954033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12643954003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63528 + ... + 171241.

It is an arithmetic number, because the mean of its divisors is an integer number (3161060665).

Almost surely, 2^12643954033 is an apocalyptic number.

It is an amenable number.

12643954033 is a deficient number, since it is larger than the sum of its proper divisors (288627).

12643954033 is an equidigital number, since it uses as much as digits as its factorization.

12643954033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288626.

The product of its (nonzero) digits is 233280, while the sum is 40.

The spelling of 12643954033 in words is "twelve billion, six hundred forty-three million, nine hundred fifty-four thousand, thirty-three".