668933886079 has 2 divisors, whose sum is σ = 668933886080. Its totient is φ = 668933886078.

The previous prime is 668933886041. The next prime is 668933886097. The reversal of 668933886079 is 970688339866.

Together with next prime (668933886097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668933886079 - 2¹⁵ = 668933853311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668933887079) 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, 334466943039 + 334466943040.

It is an arithmetic number, because the mean of its divisors is an integer number (334466943040).

Almost surely, 2^668933886079 is an apocalyptic number.

668933886079 is a deficient number, since it is larger than the sum of its proper divisors (1).

668933886079 is an equidigital number, since it uses as much as digits as its factorization.

668933886079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564350976, while the sum is 73.

The spelling of 668933886079 in words is "six hundred sixty-eight billion, nine hundred thirty-three million, eight hundred eighty-six thousand, seventy-nine".