168945685 has 4 divisors (see below), whose sum is σ = 202734828. Its totient is φ = 135156544.

The previous prime is 168945653. The next prime is 168945697. The reversal of 168945685 is 586549861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586549861 = 17 ⋅34502933.

It can be written as a sum of positive squares in 2 ways, for example, as 80604484 + 88341201 = 8978^2 + 9399^2 .

It is a cyclic number.

It is not a de Polignac number, because 168945685 - 2⁵ = 168945653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16894564 + ... + 16894573.

It is an arithmetic number, because the mean of its divisors is an integer number (50683707).

Almost surely, 2^168945685 is an apocalyptic number.

It is an amenable number.

168945685 is a deficient number, since it is larger than the sum of its proper divisors (33789143).

168945685 is an equidigital number, since it uses as much as digits as its factorization.

168945685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33789142.

The product of its digits is 2073600, while the sum is 52.

The square root of 168945685 is about 12997.9107936622. The cubic root of 168945685 is about 552.8182451587.

It can be divided in two parts, 1689 and 45685, that added together give a palindrome (47374).

The spelling of 168945685 in words is "one hundred sixty-eight million, nine hundred forty-five thousand, six hundred eighty-five".