668766343135417 has 2 divisors, whose sum is σ = 668766343135418. Its totient is φ = 668766343135416.

The previous prime is 668766343135393. The next prime is 668766343135523. The reversal of 668766343135417 is 714531343667866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346485612287376 + 322280730848041 = 18614124^2 + 17952179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668766343135417 is a prime.

It is not a weakly prime, because it can be changed into another prime (668766343133417) 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, 334383171567708 + 334383171567709.

It is an arithmetic number, because the mean of its divisors is an integer number (334383171567709).

Almost surely, 2^{668766343135417} is an apocalyptic number.

It is an amenable number.

668766343135417 is a deficient number, since it is larger than the sum of its proper divisors (1).

668766343135417 is an equidigital number, since it uses as much as digits as its factorization.

668766343135417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1097349120, while the sum is 70.

The spelling of 668766343135417 in words is "six hundred sixty-eight trillion, seven hundred sixty-six billion, three hundred forty-three million, one hundred thirty-five thousand, four hundred seventeen".