663755866 has 8 divisors (see below), whose sum is σ = 995772960. Its totient is φ = 331831548.

The previous prime is 663755863. The next prime is 663755879. The reversal of 663755866 is 668557366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (663755863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096 + ... + 36451.

It is an arithmetic number, because the mean of its divisors is an integer number (124471620).

Almost surely, 2^663755866 is an apocalyptic number.

663755866 is a deficient number, since it is larger than the sum of its proper divisors (332017094).

663755866 is a wasteful number, since it uses less digits than its factorization.

663755866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46388.

The product of its digits is 5443200, while the sum is 52.

The square root of 663755866 is about 25763.4598996330. The cubic root of 663755866 is about 872.3072005256.

The spelling of 663755866 in words is "six hundred sixty-three million, seven hundred fifty-five thousand, eight hundred sixty-six".