66000321 has 6 divisors (see below), whose sum is σ = 95333810. Its totient is φ = 44000208.

The previous prime is 66000299. The next prime is 66000329. The reversal of 66000321 is 12300066.

It is a happy number.

66000321 is a `hidden beast` number, since 660 + 0 + 0 + 3 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 49280400 + 16719921 = 7020^2 + 4089^2 .

It is not a de Polignac number, because 66000321 - 2⁶ = 66000257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66000294 and 66000303.

It is not an unprimeable number, because it can be changed into a prime (66000329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3666676 + ... + 3666693.

Almost surely, 2^66000321 is an apocalyptic number.

It is an amenable number.

66000321 is a deficient number, since it is larger than the sum of its proper divisors (29333489).

66000321 is a wasteful number, since it uses less digits than its factorization.

66000321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7333375 (or 7333372 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 66000321 is about 8124.0581607962. The cubic root of 66000321 is about 404.1246572319.

Adding to 66000321 its reverse (12300066), we get a palindrome (78300387).

The spelling of 66000321 in words is "sixty-six million, three hundred twenty-one", and thus it is an aban number.