663648066 has 28 divisors (see below), whose sum is σ = 1492528662. Its totient is φ = 221215536.

The previous prime is 663648061. The next prime is 663648067. The reversal of 663648066 is 660846366.

663648066 is a `hidden beast` number, since 6 + 636 + 4 + 8 + 0 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 555592041 + 108056025 = 23571^2 + 10395^2 .

It is not an unprimeable number, because it can be changed into a prime (663648061) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 226131 + ... + 229046.

Almost surely, 2^663648066 is an apocalyptic number.

663648066 is an abundant number, since it is smaller than the sum of its proper divisors (828880596).

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

663648066 is an equidigital number, since it uses as much as digits as its factorization.

663648066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455197 (or 455182 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The square root of 663648066 is about 25761.3677043747. The cubic root of 663648066 is about 872.2599744233.

The spelling of 663648066 in words is "six hundred sixty-three million, six hundred forty-eight thousand, sixty-six".