168686861 has 12 divisors (see below), whose sum is σ = 197779968. Its totient is φ = 143444952.

The previous prime is 168686821. The next prime is 168686873.

It is a happy number.

168686861 is nontrivially palindromic in base 10.

168686861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 168686861 - 2⁶ = 168686797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168686821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7331 + ... + 19776.

It is an arithmetic number, because the mean of its divisors is an integer number (16481664).

Almost surely, 2^168686861 is an apocalyptic number.

It is an amenable number.

168686861 is a deficient number, since it is larger than the sum of its proper divisors (29093107).

168686861 is a wasteful number, since it uses less digits than its factorization.

168686861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27248 (or 27241 counting only the distinct ones).

The product of its digits is 663552, while the sum is 50.

The square root of 168686861 is about 12987.9506081599. The cubic root of 168686861 is about 552.5357958831.

The spelling of 168686861 in words is "one hundred sixty-eight million, six hundred eighty-six thousand, eight hundred sixty-one".