1668516668519 has 2 divisors, whose sum is σ = 1668516668520. Its totient is φ = 1668516668518.

The previous prime is 1668516668501. The next prime is 1668516668527. The reversal of 1668516668519 is 9158666158661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1668516668519 - 2¹⁶ = 1668516602983 is a prime.

It is a super-2 number, since 2×1668516668519² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668516668579) 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, 834258334259 + 834258334260.

It is an arithmetic number, because the mean of its divisors is an integer number (834258334260).

Almost surely, 2^{1668516668519} is an apocalyptic number.

1668516668519 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668516668519 is an equidigital number, since it uses as much as digits as its factorization.

1668516668519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 111974400, while the sum is 68.

The spelling of 1668516668519 in words is "one trillion, six hundred sixty-eight billion, five hundred sixteen million, six hundred sixty-eight thousand, five hundred nineteen".