668216063 has 2 divisors, whose sum is σ = 668216064. Its totient is φ = 668216062.

The previous prime is 668216051. The next prime is 668216077. The reversal of 668216063 is 360612866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668216063 - 2⁴ = 668216047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668216023) 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, 334108031 + 334108032.

It is an arithmetic number, because the mean of its divisors is an integer number (334108032).

Almost surely, 2^668216063 is an apocalyptic number.

668216063 is a deficient number, since it is larger than the sum of its proper divisors (1).

668216063 is an equidigital number, since it uses as much as digits as its factorization.

668216063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 668216063 is about 25849.8754929303. The cubic root of 668216063 is about 874.2567023110.

The spelling of 668216063 in words is "six hundred sixty-eight million, two hundred sixteen thousand, sixty-three".