1968961018517 has 2 divisors, whose sum is σ = 1968961018518. Its totient is φ = 1968961018516.

The previous prime is 1968961018483. The next prime is 1968961018523. The reversal of 1968961018517 is 7158101698691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1093699731601 + 875261286916 = 1045801^2 + 935554^2 .

It is a cyclic number.

It is not a de Polignac number, because 1968961018517 - 2¹⁴ = 1968961002133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1968961018517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1968961018417) 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, 984480509258 + 984480509259.

It is an arithmetic number, because the mean of its divisors is an integer number (984480509259).

Almost surely, 2^{1968961018517} is an apocalyptic number.

It is an amenable number.

1968961018517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968961018517 is an equidigital number, since it uses as much as digits as its factorization.

1968961018517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 62.

The spelling of 1968961018517 in words is "one trillion, nine hundred sixty-eight billion, nine hundred sixty-one million, eighteen thousand, five hundred seventeen".