663606066 has 32 divisors (see below), whose sum is σ = 1358622720. Its totient is φ = 215989136.

The previous prime is 663606059. The next prime is 663606079. The reversal of 663606066 is 660606366.

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, 129175 + ... + 134213.

It is an arithmetic number, because the mean of its divisors is an integer number (42456960).

Almost surely, 2^663606066 is an apocalyptic number.

663606066 is an abundant number, since it is smaller than the sum of its proper divisors (695016654).

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

663606066 is a wasteful number, since it uses less digits than its factorization.

663606066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5558.

The product of its (nonzero) digits is 139968, while the sum is 39.

The square root of 663606066 is about 25760.5525173665. The cubic root of 663606066 is about 872.2415732587.

The spelling of 663606066 in words is "six hundred sixty-three million, six hundred six thousand, sixty-six".