6643436343466 has 16 divisors (see below), whose sum is σ = 10731802753224. Its totient is φ = 3066173420544.

The previous prime is 6643436343463. The next prime is 6643436343491.

It is a happy number.

6643436343466 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 5682163945441 + 961272398025 = 2383729^2 + 980445^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6643436343466.

It is not an unprimeable number, because it can be changed into a prime (6643436343463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1891066 + ... + 4106458.

Almost surely, 2^{6643436343466} is an apocalyptic number.

6643436343466 is a deficient number, since it is larger than the sum of its proper divisors (4088366409758).

6643436343466 is a wasteful number, since it uses less digits than its factorization.

6643436343466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330745.

The product of its digits is 161243136, while the sum is 58.

The spelling of 6643436343466 in words is "six trillion, six hundred forty-three billion, four hundred thirty-six million, three hundred forty-three thousand, four hundred sixty-six".