663221568 has 28 divisors (see below), whose sum is σ = 1754774240. Its totient is φ = 221073792.

The previous prime is 663221549. The next prime is 663221569. The reversal of 663221568 is 865122366.

663221568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663221569) 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, 1726948 + ... + 1727331.

Almost surely, 2^663221568 is an apocalyptic number.

It is an amenable number.

663221568 is an abundant number, since it is smaller than the sum of its proper divisors (1091552672).

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

663221568 is a wasteful number, since it uses less digits than its factorization.

663221568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3454294 (or 3454284 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 663221568 is about 25753.0885138074. The cubic root of 663221568 is about 872.0730797546.

The spelling of 663221568 in words is "six hundred sixty-three million, two hundred twenty-one thousand, five hundred sixty-eight".