168606689 has 2 divisors, whose sum is σ = 168606690. Its totient is φ = 168606688.

The previous prime is 168606679. The next prime is 168606701. The reversal of 168606689 is 986606861.

168606689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168558289 + 48400 = 12983^2 + 220^2 .

It is an emirp because it is prime and its reverse (986606861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168606689 - 2⁸ = 168606433 is a prime.

It is not a weakly prime, because it can be changed into another prime (168606679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84303344 + 84303345.

It is an arithmetic number, because the mean of its divisors is an integer number (84303345).

Almost surely, 2^168606689 is an apocalyptic number.

It is an amenable number.

168606689 is a deficient number, since it is larger than the sum of its proper divisors (1).

168606689 is an equidigital number, since it uses as much as digits as its factorization.

168606689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 168606689 is about 12984.8638421818. The cubic root of 168606689 is about 552.4482472358.

The spelling of 168606689 in words is "one hundred sixty-eight million, six hundred six thousand, six hundred eighty-nine".