643344444443346 has 32 divisors (see below), whose sum is σ = 1338191660048640. Its totient is φ = 206011084496256.

The previous prime is 643344444443219. The next prime is 643344444443369.

643344444443346 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×643344444443346² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643344444443346.

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, 18341425171 + ... + 18341460246.

It is an arithmetic number, because the mean of its divisors is an integer number (41818489376520).

Almost surely, 2^{643344444443346} is an apocalyptic number.

643344444443346 is an abundant number, since it is smaller than the sum of its proper divisors (694847215605294).

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

643344444443346 is a wasteful number, since it uses less digits than its factorization.

643344444443346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36682885538.

The product of its digits is 764411904, while the sum is 60.

The spelling of 643344444443346 in words is "six hundred forty-three trillion, three hundred forty-four billion, four hundred forty-four million, four hundred forty-three thousand, three hundred forty-six".