66321113 has 2 divisors, whose sum is σ = 66321114. Its totient is φ = 66321112.

The previous prime is 66321071. The next prime is 66321119. The reversal of 66321113 is 31112366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65496649 + 824464 = 8093^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 66321113 - 2⁶ = 66321049 is a prime.

It is not a weakly prime, because it can be changed into another prime (66321119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33160556 + 33160557.

It is an arithmetic number, because the mean of its divisors is an integer number (33160557).

Almost surely, 2^66321113 is an apocalyptic number.

It is an amenable number.

66321113 is a deficient number, since it is larger than the sum of its proper divisors (1).

66321113 is an equidigital number, since it uses as much as digits as its factorization.

66321113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 66321113 is about 8143.7775632688. Note that the first 3 decimals coincide. The cubic root of 66321113 is about 404.7783433743.

Adding to 66321113 its reverse (31112366), we get a palindrome (97433479).

The spelling of 66321113 in words is "sixty-six million, three hundred twenty-one thousand, one hundred thirteen".