667688333189 has 2 divisors, whose sum is σ = 667688333190. Its totient is φ = 667688333188.

The previous prime is 667688333173. The next prime is 667688333281. The reversal of 667688333189 is 981333886766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661321889089 + 6366444100 = 813217^2 + 79790^2 .

It is a cyclic number.

It is not a de Polignac number, because 667688333189 - 2⁴ = 667688333173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667688333129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333844166594 + 333844166595.

It is an arithmetic number, because the mean of its divisors is an integer number (333844166595).

Almost surely, 2^667688333189 is an apocalyptic number.

It is an amenable number.

667688333189 is a deficient number, since it is larger than the sum of its proper divisors (1).

667688333189 is an equidigital number, since it uses as much as digits as its factorization.

667688333189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188116992, while the sum is 68.

The spelling of 667688333189 in words is "six hundred sixty-seven billion, six hundred eighty-eight million, three hundred thirty-three thousand, one hundred eighty-nine".