668055367321 has 2 divisors, whose sum is σ = 668055367322. Its totient is φ = 668055367320.

The previous prime is 668055367297. The next prime is 668055367337. The reversal of 668055367321 is 123763550866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 501745555600 + 166309811721 = 708340^2 + 407811^2 .

It is a cyclic number.

It is not a de Polignac number, because 668055367321 - 2⁷ = 668055367193 is a prime.

It is not a weakly prime, because it can be changed into another prime (668055347321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334027683660 + 334027683661.

It is an arithmetic number, because the mean of its divisors is an integer number (334027683661).

Almost surely, 2^668055367321 is an apocalyptic number.

It is an amenable number.

668055367321 is a deficient number, since it is larger than the sum of its proper divisors (1).

668055367321 is an equidigital number, since it uses as much as digits as its factorization.

668055367321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 668055367321 in words is "six hundred sixty-eight billion, fifty-five million, three hundred sixty-seven thousand, three hundred twenty-one".