663805856 has 48 divisors (see below), whose sum is σ = 1497323520. Its totient is φ = 283772160.

The previous prime is 663805811. The next prime is 663805903. The reversal of 663805856 is 658508366.

663805856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 663805856.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90785 + ... + 97823.

It is an arithmetic number, because the mean of its divisors is an integer number (31194240).

Almost surely, 2^663805856 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 663805856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (748661760).

663805856 is an abundant number, since it is smaller than the sum of its proper divisors (833517664).

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

663805856 is a wasteful number, since it uses less digits than its factorization.

663805856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7477 (or 7469 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 47.

The square root of 663805856 is about 25764.4300538553. The cubic root of 663805856 is about 872.3290989095.

The spelling of 663805856 in words is "six hundred sixty-three million, eight hundred five thousand, eight hundred fifty-six".