6663644066 has 8 divisors (see below), whose sum is σ = 9995975964. Its totient is φ = 3331652080.

The previous prime is 6663643999. The next prime is 6663644069. The reversal of 6663644066 is 6604463666.

It can be written as a sum of positive squares in 2 ways, for example, as 6657744025 + 5900041 = 81595^2 + 2429^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6663644066.

It is not an unprimeable number, because it can be changed into a prime (6663644069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28445 + ... + 118896.

Almost surely, 2^6663644066 is an apocalyptic number.

6663644066 is a deficient number, since it is larger than the sum of its proper divisors (3332331898).

6663644066 is a wasteful number, since it uses less digits than its factorization.

6663644066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169956.

The product of its (nonzero) digits is 2239488, while the sum is 47.

The square root of 6663644066 is about 81631.1464209587. The cubic root of 6663644066 is about 1881.7875771513.

The spelling of 6663644066 in words is "six billion, six hundred sixty-three million, six hundred forty-four thousand, sixty-six".