663717220 has 12 divisors (see below), whose sum is σ = 1393806204. Its totient is φ = 265486880.

The previous prime is 663717193. The next prime is 663717227. The reversal of 663717220 is 22717366.

It is a happy number.

663717220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 348867684 + 314849536 = 18678^2 + 17744^2 .

It is not an unprimeable number, because it can be changed into a prime (663717227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16592911 + ... + 16592950.

It is an arithmetic number, because the mean of its divisors is an integer number (116150517).

Almost surely, 2^663717220 is an apocalyptic number.

It is an amenable number.

663717220 is an abundant number, since it is smaller than the sum of its proper divisors (730088984).

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

663717220 is a wasteful number, since it uses less digits than its factorization.

663717220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33185870 (or 33185868 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 663717220 is about 25762.7098729928. The cubic root of 663717220 is about 872.2902706874.

The spelling of 663717220 in words is "six hundred sixty-three million, seven hundred seventeen thousand, two hundred twenty".