66241143209 has 2 divisors, whose sum is σ = 66241143210. Its totient is φ = 66241143208.

The previous prime is 66241143181. The next prime is 66241143211. The reversal of 66241143209 is 90234114266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37603027225 + 28638115984 = 193915^2 + 169228^2 .

It is a cyclic number.

It is not a de Polignac number, because 66241143209 - 2¹⁶ = 66241077673 is a prime.

Together with 66241143211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66241149209) 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, 33120571604 + 33120571605.

It is an arithmetic number, because the mean of its divisors is an integer number (33120571605).

Almost surely, 2^66241143209 is an apocalyptic number.

It is an amenable number.

66241143209 is a deficient number, since it is larger than the sum of its proper divisors (1).

66241143209 is an equidigital number, since it uses as much as digits as its factorization.

66241143209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 66241143209 in words is "sixty-six billion, two hundred forty-one million, one hundred forty-three thousand, two hundred nine".