667699213 has 2 divisors, whose sum is σ = 667699214. Its totient is φ = 667699212.

The previous prime is 667699189. The next prime is 667699217. The reversal of 667699213 is 312996766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 494039529 + 173659684 = 22227^2 + 13178^2 .

It is a cyclic number.

It is not a de Polignac number, because 667699213 - 2⁹ = 667698701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667699217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333849606 + 333849607.

It is an arithmetic number, because the mean of its divisors is an integer number (333849607).

Almost surely, 2^667699213 is an apocalyptic number.

It is an amenable number.

667699213 is a deficient number, since it is larger than the sum of its proper divisors (1).

667699213 is an equidigital number, since it uses as much as digits as its factorization.

667699213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 49.

The square root of 667699213 is about 25839.8764122432. The cubic root of 667699213 is about 874.0312382469.

The spelling of 667699213 in words is "six hundred sixty-seven million, six hundred ninety-nine thousand, two hundred thirteen".