666873342029 has 2 divisors, whose sum is σ = 666873342030. Its totient is φ = 666873342028.

The previous prime is 666873341989. The next prime is 666873342209. The reversal of 666873342029 is 920243378666.

Together with next prime (666873342209) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666838826404 + 34515625 = 816602^2 + 5875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666873342029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666873345029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333436671014 + 333436671015.

It is an arithmetic number, because the mean of its divisors is an integer number (333436671015).

Almost surely, 2^666873342029 is an apocalyptic number.

It is an amenable number.

666873342029 is a deficient number, since it is larger than the sum of its proper divisors (1).

666873342029 is an equidigital number, since it uses as much as digits as its factorization.

666873342029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 56.

The spelling of 666873342029 in words is "six hundred sixty-six billion, eight hundred seventy-three million, three hundred forty-two thousand, twenty-nine".