663423321 has 8 divisors (see below), whose sum is σ = 964979424. Its totient is φ = 402074720.

The previous prime is 663423311. The next prime is 663423329. The reversal of 663423321 is 123324366.

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 663423321 - 2¹¹ = 663421273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663423329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10051836 + ... + 10051901.

It is an arithmetic number, because the mean of its divisors is an integer number (120622428).

Almost surely, 2^663423321 is an apocalyptic number.

It is an amenable number.

663423321 is a deficient number, since it is larger than the sum of its proper divisors (301556103).

663423321 is a wasteful number, since it uses less digits than its factorization.

663423321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20103751.

The product of its digits is 15552, while the sum is 30.

The square root of 663423321 is about 25757.0052801175. The cubic root of 663423321 is about 872.1614994376.

Adding to 663423321 its reverse (123324366), we get a palindrome (786747687).

The spelling of 663423321 in words is "six hundred sixty-three million, four hundred twenty-three thousand, three hundred twenty-one".