66864683 has 2 divisors, whose sum is σ = 66864684. Its totient is φ = 66864682.

The previous prime is 66864647. The next prime is 66864697. The reversal of 66864683 is 38646866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66864683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66864983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33432341 + 33432342.

It is an arithmetic number, because the mean of its divisors is an integer number (33432342).

Almost surely, 2^66864683 is an apocalyptic number.

66864683 is a deficient number, since it is larger than the sum of its proper divisors (1).

66864683 is an equidigital number, since it uses as much as digits as its factorization.

66864683 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 47.

The square root of 66864683 is about 8177.0827927813. The cubic root of 66864683 is about 405.8811946621.

The spelling of 66864683 in words is "sixty-six million, eight hundred sixty-four thousand, six hundred eighty-three".