663321656 has 32 divisors (see below), whose sum is σ = 1299261600. Its totient is φ = 316884480.

The previous prime is 663321653. The next prime is 663321661. The reversal of 663321656 is 656123366.

It is a happy number.

663321656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663321653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241700 + ... + 244428.

It is an arithmetic number, because the mean of its divisors is an integer number (40601925).

Almost surely, 2^663321656 is an apocalyptic number.

It is an amenable number.

663321656 is a deficient number, since it is larger than the sum of its proper divisors (635939944).

663321656 is a wasteful number, since it uses less digits than its factorization.

663321656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079 (or 4075 counting only the distinct ones).

The product of its digits is 116640, while the sum is 38.

The square root of 663321656 is about 25755.0316637351. The cubic root of 663321656 is about 872.1169462714.

The spelling of 663321656 in words is "six hundred sixty-three million, three hundred twenty-one thousand, six hundred fifty-six".