66070321 has 2 divisors, whose sum is σ = 66070322. Its totient is φ = 66070320.

The previous prime is 66070247. The next prime is 66070337. The reversal of 66070321 is 12307066.

66070321 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., 45495025 + 20575296 = 6745^2 + 4536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66070321 is a prime.

It is not a weakly prime, because it can be changed into another prime (66070351) 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, 33035160 + 33035161.

It is an arithmetic number, because the mean of its divisors is an integer number (33035161).

Almost surely, 2^66070321 is an apocalyptic number.

It is an amenable number.

66070321 is a deficient number, since it is larger than the sum of its proper divisors (1).

66070321 is an equidigital number, since it uses as much as digits as its factorization.

66070321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 66070321 is about 8128.3652107912. The cubic root of 66070321 is about 404.2674784104.

Adding to 66070321 its reverse (12307066), we get a palindrome (78377387).

The spelling of 66070321 in words is "sixty-six million, seventy thousand, three hundred twenty-one".