1668686703667 has 2 divisors, whose sum is σ = 1668686703668. Its totient is φ = 1668686703666.

The previous prime is 1668686703637. The next prime is 1668686703679. The reversal of 1668686703667 is 7663076868661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1668686703667 - 2⁷ = 1668686703539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1668686703596 and 1668686703605.

It is not a weakly prime, because it can be changed into another prime (1668686703617) 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, 834343351833 + 834343351834.

It is an arithmetic number, because the mean of its divisors is an integer number (834343351834).

Almost surely, 2^{1668686703667} is an apocalyptic number.

1668686703667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668686703667 is an equidigital number, since it uses as much as digits as its factorization.

1668686703667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 438939648, while the sum is 70.

The spelling of 1668686703667 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred three thousand, six hundred sixty-seven".