168685861 has 8 divisors (see below), whose sum is σ = 172910144. Its totient is φ = 164475360.

The previous prime is 168685831. The next prime is 168685873. The reversal of 168685861 is 168586861.

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

It is a cyclic number.

It is not a de Polignac number, because 168685861 - 2¹⁹ = 168161573 is a prime.

It is a super-2 number, since 2×168685861² = 56909839402622642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168685831) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 24025 + ... + 30241.

It is an arithmetic number, because the mean of its divisors is an integer number (21613768).

Almost surely, 2^168685861 is an apocalyptic number.

It is an amenable number.

168685861 is a deficient number, since it is larger than the sum of its proper divisors (4224283).

168685861 is an equidigital number, since it uses as much as digits as its factorization.

168685861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6891.

The product of its digits is 552960, while the sum is 49.

The square root of 168685861 is about 12987.9121108822. The cubic root of 168685861 is about 552.5347040437.

The spelling of 168685861 in words is "one hundred sixty-eight million, six hundred eighty-five thousand, eight hundred sixty-one".