168865985 has 8 divisors (see below), whose sum is σ = 209626920. Its totient is φ = 130434304.

The previous prime is 168865979. The next prime is 168865997. The reversal of 168865985 is 589568861.

It can be written as a sum of positive squares in 4 ways, for example, as 20830096 + 148035889 = 4564^2 + 12167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168865985 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168865985.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 582152 + ... + 582441.

It is an arithmetic number, because the mean of its divisors is an integer number (26203365).

Almost surely, 2^168865985 is an apocalyptic number.

It is an amenable number.

168865985 is a deficient number, since it is larger than the sum of its proper divisors (40760935).

168865985 is a wasteful number, since it uses less digits than its factorization.

168865985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164627.

The product of its digits is 4147200, while the sum is 56.

The square root of 168865985 is about 12994.8445546686. The cubic root of 168865985 is about 552.7313009547.

The spelling of 168865985 in words is "one hundred sixty-eight million, eight hundred sixty-five thousand, nine hundred eighty-five".