168087661187 has 2 divisors, whose sum is σ = 168087661188. Its totient is φ = 168087661186.

The previous prime is 168087661123. The next prime is 168087661193. The reversal of 168087661187 is 781166780861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168087661187 - 2⁶ = 168087661123 is a prime.

It is not a weakly prime, because it can be changed into another prime (168087661487) 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, 84043830593 + 84043830594.

It is an arithmetic number, because the mean of its divisors is an integer number (84043830594).

Almost surely, 2^168087661187 is an apocalyptic number.

168087661187 is a deficient number, since it is larger than the sum of its proper divisors (1).

168087661187 is an equidigital number, since it uses as much as digits as its factorization.

168087661187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5419008, while the sum is 59.

The spelling of 168087661187 in words is "one hundred sixty-eight billion, eighty-seven million, six hundred sixty-one thousand, one hundred eighty-seven".