168665863 has 2 divisors, whose sum is σ = 168665864. Its totient is φ = 168665862.

The previous prime is 168665747. The next prime is 168665879. The reversal of 168665863 is 368566861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168665863 - 2¹⁷ = 168534791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168666863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84332931 + 84332932.

It is an arithmetic number, because the mean of its divisors is an integer number (84332932).

Almost surely, 2^168665863 is an apocalyptic number.

168665863 is a deficient number, since it is larger than the sum of its proper divisors (1).

168665863 is an equidigital number, since it uses as much as digits as its factorization.

168665863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 49.

The square root of 168665863 is about 12987.1422183635. The cubic root of 168665863 is about 552.5128685332.

The spelling of 168665863 in words is "one hundred sixty-eight million, six hundred sixty-five thousand, eight hundred sixty-three".