663007321 has 8 divisors (see below), whose sum is σ = 667779840. Its totient is φ = 658251312.

The previous prime is 663007313. The next prime is 663007349. The reversal of 663007321 is 123700366.

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

It is a cyclic number.

It is not a de Polignac number, because 663007321 - 2³ = 663007313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663007321.

It is not an unprimeable number, because it can be changed into a prime (663007391) 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 7 ways as a sum of consecutive naturals, for example, 82926 + ... + 90568.

It is an arithmetic number, because the mean of its divisors is an integer number (83472480).

Almost surely, 2^663007321 is an apocalyptic number.

It is an amenable number.

663007321 is a deficient number, since it is larger than the sum of its proper divisors (4772519).

663007321 is a wasteful number, since it uses less digits than its factorization.

663007321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8255.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 663007321 is about 25748.9285408151. The cubic root of 663007321 is about 871.9791648537.

Adding to 663007321 its reverse (123700366), we get a palindrome (786707687).

The spelling of 663007321 in words is "six hundred sixty-three million, seven thousand, three hundred twenty-one".