1668686703539 has 2 divisors, whose sum is σ = 1668686703540. Its totient is φ = 1668686703538.

The previous prime is 1668686703527. The next prime is 1668686703581. The reversal of 1668686703539 is 9353076868661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9353076868661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1668686703539 - 2²⁰ = 1668685654963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668686700539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834343351769 + 834343351770.

It is an arithmetic number, because the mean of its divisors is an integer number (834343351770).

Almost surely, 2^{1668686703539} is an apocalyptic number.

1668686703539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668686703539 is an equidigital number, since it uses as much as digits as its factorization.

1668686703539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235146240, while the sum is 68.

The spelling of 1668686703539 in words is "one trillion, six hundred sixty-eight billion, six hundred eighty-six million, seven hundred three thousand, five hundred thirty-nine".