6643663466 has 16 divisors (see below), whose sum is σ = 10967660928. Its totient is φ = 2993121600.

The previous prime is 6643663451. The next prime is 6643663487.

6643663466 is nontrivially palindromic in base 10.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1333730 + ... + 1338701.

It is an arithmetic number, because the mean of its divisors is an integer number (685478808).

Almost surely, 2^6643663466 is an apocalyptic number.

6643663466 is a deficient number, since it is larger than the sum of its proper divisors (4323997462).

6643663466 is a wasteful number, since it uses less digits than its factorization.

6643663466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672557.

The product of its digits is 6718464, while the sum is 50.

The square root of 6643663466 is about 81508.6711092752. The cubic root of 6643663466 is about 1879.9048791846.

The spelling of 6643663466 in words is "six billion, six hundred forty-three million, six hundred sixty-three thousand, four hundred sixty-six".