663616660 has 48 divisors (see below), whose sum is σ = 1619694720. Its totient is φ = 223666560.

The previous prime is 663616651. The next prime is 663616661. The reversal of 663616660 is 66616366.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663616661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31911 + ... + 48430.

It is an arithmetic number, because the mean of its divisors is an integer number (33743640).

Almost surely, 2^663616660 is an apocalyptic number.

It is an amenable number.

663616660 is an abundant number, since it is smaller than the sum of its proper divisors (956078060).

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

663616660 is a wasteful number, since it uses less digits than its factorization.

663616660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80416 (or 80414 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 663616660 is about 25760.7581410175. The cubic root of 663616660 is about 872.2462148067.

The spelling of 663616660 in words is "six hundred sixty-three million, six hundred sixteen thousand, six hundred sixty".