666593581117 has 2 divisors, whose sum is σ = 666593581118. Its totient is φ = 666593581116.

The previous prime is 666593581079. The next prime is 666593581163. The reversal of 666593581117 is 711185395666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585269370841 + 81324210276 = 765029^2 + 285174^2 .

It is a cyclic number.

It is not a de Polignac number, because 666593581117 - 2²⁷ = 666459363389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666593591117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333296790558 + 333296790559.

It is an arithmetic number, because the mean of its divisors is an integer number (333296790559).

Almost surely, 2^666593581117 is an apocalyptic number.

It is an amenable number.

666593581117 is a deficient number, since it is larger than the sum of its proper divisors (1).

666593581117 is an equidigital number, since it uses as much as digits as its factorization.

666593581117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8164800, while the sum is 58.

The spelling of 666593581117 in words is "six hundred sixty-six billion, five hundred ninety-three million, five hundred eighty-one thousand, one hundred seventeen".