168668685 has 12 divisors (see below), whose sum is σ = 292359132. Its totient is φ = 89956608.

The previous prime is 168668677. The next prime is 168668693. The reversal of 168668685 is 586866861.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (168668677) and next prime (168668693).

It can be written as a sum of positive squares in 2 ways, for example, as 24740676 + 143928009 = 4974^2 + 11997^2 .

It is not a de Polignac number, because 168668685 - 2³ = 168668677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1874052 + ... + 1874141.

It is an arithmetic number, because the mean of its divisors is an integer number (24363261).

Almost surely, 2^168668685 is an apocalyptic number.

168668685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

168668685 is a deficient number, since it is larger than the sum of its proper divisors (123690447).

168668685 is a wasteful number, since it uses less digits than its factorization.

168668685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748204 (or 3748201 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The square root of 168668685 is about 12987.2508638280. The cubic root of 168668685 is about 552.5159499364.

The spelling of 168668685 in words is "one hundred sixty-eight million, six hundred sixty-eight thousand, six hundred eighty-five".