1668518686337 has 2 divisors, whose sum is σ = 1668518686338. Its totient is φ = 1668518686336.

The previous prime is 1668518686333. The next prime is 1668518686339. The reversal of 1668518686337 is 7336868158661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1301232992656 + 367285693681 = 1140716^2 + 606041^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668518686337 - 2² = 1668518686333 is a prime.

Together with 1668518686339, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1668518686333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834259343168 + 834259343169.

It is an arithmetic number, because the mean of its divisors is an integer number (834259343169).

Almost surely, 2^{1668518686337} is an apocalyptic number.

It is an amenable number.

1668518686337 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668518686337 is an equidigital number, since it uses as much as digits as its factorization.

1668518686337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209018880, while the sum is 68.

The spelling of 1668518686337 in words is "one trillion, six hundred sixty-eight billion, five hundred eighteen million, six hundred eighty-six thousand, three hundred thirty-seven".