663052221 has 12 divisors (see below), whose sum is σ = 1031414748. Its totient is φ = 408032064.

The previous prime is 663052183. The next prime is 663052237. The reversal of 663052221 is 122250366.

663052221 is a `hidden beast` number, since 6 + 630 + 5 + 2 + 2 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 151659225 + 511392996 = 12315^2 + 22614^2 .

It is not a de Polignac number, because 663052221 - 2⁹ = 663051709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663053221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2833440 + ... + 2833673.

It is an arithmetic number, because the mean of its divisors is an integer number (85951229).

Almost surely, 2^663052221 is an apocalyptic number.

It is an amenable number.

663052221 is a deficient number, since it is larger than the sum of its proper divisors (368362527).

663052221 is a wasteful number, since it uses less digits than its factorization.

663052221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5667132 (or 5667129 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 663052221 is about 25749.8004069934. The cubic root of 663052221 is about 871.9988483874.

The spelling of 663052221 in words is "six hundred sixty-three million, fifty-two thousand, two hundred twenty-one".