663566688 has 96 divisors (see below), whose sum is σ = 1939835520. Its totient is φ = 220682880.

The previous prime is 663566671. The next prime is 663566693. The reversal of 663566688 is 886665366.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 700231 + ... + 701177.

It is an arithmetic number, because the mean of its divisors is an integer number (20206620).

Almost surely, 2^663566688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663566688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (969917760).

663566688 is an abundant number, since it is smaller than the sum of its proper divisors (1276268832).

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

663566688 is a wasteful number, since it uses less digits than its factorization.

663566688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777 (or 1763 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 663566688 is about 25759.7881978870. The cubic root of 663566688 is about 872.2243201474.

The spelling of 663566688 in words is "six hundred sixty-three million, five hundred sixty-six thousand, six hundred eighty-eight".