668055347321 has 2 divisors, whose sum is σ = 668055347322. Its totient is φ = 668055347320.

The previous prime is 668055347303. The next prime is 668055347327. The reversal of 668055347321 is 123743550866.

668055347321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634668748921 + 33386598400 = 796661^2 + 182720^2 .

It is a cyclic number.

It is not a de Polignac number, because 668055347321 - 2¹⁸ = 668055085177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668055347321.

It is not a weakly prime, because it can be changed into another prime (668055347327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334027673660 + 334027673661.

It is an arithmetic number, because the mean of its divisors is an integer number (334027673661).

Almost surely, 2^668055347321 is an apocalyptic number.

It is an amenable number.

668055347321 is a deficient number, since it is larger than the sum of its proper divisors (1).

668055347321 is an equidigital number, since it uses as much as digits as its factorization.

668055347321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 668055347321 in words is "six hundred sixty-eight billion, fifty-five million, three hundred forty-seven thousand, three hundred twenty-one".