66289213 has 2 divisors, whose sum is σ = 66289214. Its totient is φ = 66289212.

The previous prime is 66289193. The next prime is 66289217. The reversal of 66289213 is 31298266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54715609 + 11573604 = 7397^2 + 3402^2 .

It is a cyclic number.

It is not a de Polignac number, because 66289213 - 2¹³ = 66281021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66289217) 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, 33144606 + 33144607.

It is an arithmetic number, because the mean of its divisors is an integer number (33144607).

Almost surely, 2^66289213 is an apocalyptic number.

It is an amenable number.

66289213 is a deficient number, since it is larger than the sum of its proper divisors (1).

66289213 is an equidigital number, since it uses as much as digits as its factorization.

66289213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 66289213 is about 8141.8187771529. The cubic root of 66289213 is about 404.7134344316.

The spelling of 66289213 in words is "sixty-six million, two hundred eighty-nine thousand, two hundred thirteen".