6663240321 has 16 divisors (see below), whose sum is σ = 9902030400. Its totient is φ = 3960811008.

The previous prime is 6663240307. The next prime is 6663240329. The reversal of 6663240321 is 1230423666.

It is not a de Polignac number, because 6663240321 - 2⁹ = 6663239809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6663240329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3437236 + ... + 3439173.

It is an arithmetic number, because the mean of its divisors is an integer number (618876900).

Almost surely, 2^6663240321 is an apocalyptic number.

It is an amenable number.

6663240321 is a deficient number, since it is larger than the sum of its proper divisors (3238790079).

6663240321 is a wasteful number, since it uses less digits than its factorization.

6663240321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6876448.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 6663240321 is about 81628.6733997313. The cubic root of 6663240321 is about 1881.7495710362.

Adding to 6663240321 its reverse (1230423666), we get a palindrome (7893663987).

It can be divided in two parts, 66632 and 40321, that added together give a triangular number (106953 = T₄₆₂).

The spelling of 6663240321 in words is "six billion, six hundred sixty-three million, two hundred forty thousand, three hundred twenty-one".