66191683 has 2 divisors, whose sum is σ = 66191684. Its totient is φ = 66191682.

The previous prime is 66191669. The next prime is 66191701. The reversal of 66191683 is 38619166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66191683 - 2¹⁷ = 66060611 is a prime.

It is not a weakly prime, because it can be changed into another prime (66192683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33095841 + 33095842.

It is an arithmetic number, because the mean of its divisors is an integer number (33095842).

Almost surely, 2^66191683 is an apocalyptic number.

66191683 is a deficient number, since it is larger than the sum of its proper divisors (1).

66191683 is an equidigital number, since it uses as much as digits as its factorization.

66191683 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 66191683 is about 8135.8271245154. The cubic root of 66191683 is about 404.5148547367.

The spelling of 66191683 in words is "sixty-six million, one hundred ninety-one thousand, six hundred eighty-three".