663536656 has 80 divisors (see below), whose sum is σ = 1398124800. Its totient is φ = 303908864.

The previous prime is 663536581. The next prime is 663536659. The reversal of 663536656 is 656635366.

It is not an unprimeable number, because it can be changed into a prime (663536659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2776185 + ... + 2776423.

It is an arithmetic number, because the mean of its divisors is an integer number (17476560).

Almost surely, 2^663536656 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 663536656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699062400).

663536656 is an abundant number, since it is smaller than the sum of its proper divisors (734588144).

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

663536656 is a wasteful number, since it uses less digits than its factorization.

663536656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496 (or 490 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 46.

The square root of 663536656 is about 25759.2052672438. The cubic root of 663536656 is about 872.2111614418.

The spelling of 663536656 in words is "six hundred sixty-three million, five hundred thirty-six thousand, six hundred fifty-six".