6663443666 has 32 divisors (see below), whose sum is σ = 11453377536. Its totient is φ = 2877930000.

The previous prime is 6663443653. The next prime is 6663443669.

6663443666 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (6663443669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32801 + ... + 120011.

It is an arithmetic number, because the mean of its divisors is an integer number (357918048).

Almost surely, 2^6663443666 is an apocalyptic number.

6663443666 is a deficient number, since it is larger than the sum of its proper divisors (4789933870).

6663443666 is a wasteful number, since it uses less digits than its factorization.

6663443666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87398.

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

The square root of 6663443666 is about 81629.9189390753. The cubic root of 6663443666 is about 1881.7687128979.

The spelling of 6663443666 in words is "six billion, six hundred sixty-three million, four hundred forty-three thousand, six hundred sixty-six".