66000331 has 2 divisors, whose sum is σ = 66000332. Its totient is φ = 66000330.

The previous prime is 66000329. The next prime is 66000349. The reversal of 66000331 is 13300066.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66000331 - 2¹ = 66000329 is a prime.

It is a super-2 number, since 2×66000331² = 8712087384219122, which contains 22 as substring.

Together with 66000329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 66000299 and 66000308.

It is not a weakly prime, because it can be changed into another prime (66000371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000165 + 33000166.

It is an arithmetic number, because the mean of its divisors is an integer number (33000166).

Almost surely, 2^66000331 is an apocalyptic number.

66000331 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000331 is an equidigital number, since it uses as much as digits as its factorization.

66000331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 66000331 is about 8124.0587762522. The cubic root of 66000331 is about 404.1246776421.

Adding to 66000331 its reverse (13300066), we get a palindrome (79300397).

The spelling of 66000331 in words is "sixty-six million, three hundred thirty-one", and thus it is an aban number.