66003321 has 8 divisors (see below), whose sum is σ = 92636320. Its totient is φ = 41686272.

The previous prime is 66003319. The next prime is 66003331. The reversal of 66003321 is 12330066.

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

It is not a de Polignac number, because 66003321 - 2¹ = 66003319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66003331) 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, 578920 + ... + 579033.

It is an arithmetic number, because the mean of its divisors is an integer number (11579540).

Almost surely, 2^66003321 is an apocalyptic number.

It is an amenable number.

66003321 is a deficient number, since it is larger than the sum of its proper divisors (26632999).

66003321 is a wasteful number, since it uses less digits than its factorization.

66003321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157975.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 66003321 is about 8124.2427954856. The cubic root of 66003321 is about 404.1307802102.

Adding to 66003321 its reverse (12330066), we get a palindrome (78333387).

The spelling of 66003321 in words is "sixty-six million, three thousand, three hundred twenty-one".