66325321 has 2 divisors, whose sum is σ = 66325322. Its totient is φ = 66325320.

The previous prime is 66325309. The next prime is 66325327. The reversal of 66325321 is 12352366.

66325321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64979721 + 1345600 = 8061^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 66325321 - 2⁹ = 66324809 is a prime.

It is equal to p_3914308 and since 66325321 and 3914308 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66325321.

It is not a weakly prime, because it can be changed into another prime (66325327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33162660 + 33162661.

It is an arithmetic number, because the mean of its divisors is an integer number (33162661).

Almost surely, 2^66325321 is an apocalyptic number.

It is an amenable number.

66325321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66325321 is an equidigital number, since it uses as much as digits as its factorization.

66325321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 28.

The square root of 66325321 is about 8144.0359159326. The cubic root of 66325321 is about 404.7869041034.

Adding to 66325321 its reverse (12352366), we get a palindrome (78677687).

The spelling of 66325321 in words is "sixty-six million, three hundred twenty-five thousand, three hundred twenty-one".