1668686703679 has 2 divisors, whose sum is σ = 1668686703680. Its totient is φ = 1668686703678.

The previous prime is 1668686703667. The next prime is 1668686703701. The reversal of 1668686703679 is 9763076868661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1668686703679 - 2³⁵ = 1634326965311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668686701679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834343351839 + 834343351840.

It is an arithmetic number, because the mean of its divisors is an integer number (834343351840).

Almost surely, 2^{1668686703679} is an apocalyptic number.

1668686703679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668686703679 is an equidigital number, since it uses as much as digits as its factorization.

1668686703679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 658409472, while the sum is 73.

The spelling of 1668686703679 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred three thousand, six hundred seventy-nine".