168566987 has 2 divisors, whose sum is σ = 168566988. Its totient is φ = 168566986.

The previous prime is 168566963. The next prime is 168566989. The reversal of 168566987 is 789665861.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168566987 - 2¹⁶ = 168501451 is a prime.

Together with 168566989, 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 (168566989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84283493 + 84283494.

It is an arithmetic number, because the mean of its divisors is an integer number (84283494).

Almost surely, 2^168566987 is an apocalyptic number.

168566987 is a deficient number, since it is larger than the sum of its proper divisors (1).

168566987 is an equidigital number, since it uses as much as digits as its factorization.

168566987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The square root of 168566987 is about 12983.3349721865. The cubic root of 168566987 is about 552.4048819691.

The spelling of 168566987 in words is "one hundred sixty-eight million, five hundred sixty-six thousand, nine hundred eighty-seven".