1668158622191 has 2 divisors, whose sum is σ = 1668158622192. Its totient is φ = 1668158622190.

The previous prime is 1668158622149. The next prime is 1668158622239. The reversal of 1668158622191 is 1912268518661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1668158622191 - 2¹⁴ = 1668158605807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1668158625191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834079311095 + 834079311096.

It is an arithmetic number, because the mean of its divisors is an integer number (834079311096).

Almost surely, 2^{1668158622191} is an apocalyptic number.

1668158622191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668158622191 is an equidigital number, since it uses as much as digits as its factorization.

1668158622191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 56.

The spelling of 1668158622191 in words is "one trillion, six hundred sixty-eight billion, one hundred fifty-eight million, six hundred twenty-two thousand, one hundred ninety-one".