168646861 has 8 divisors (see below), whose sum is σ = 174777120. Its totient is φ = 162537648.

The previous prime is 168646847. The next prime is 168646867.

168646861 is nontrivially palindromic in base 10.

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 168646861 - 2⁹ = 168646349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168646867) 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, 12070 + ... + 21976.

It is an arithmetic number, because the mean of its divisors is an integer number (21847140).

Almost surely, 2^168646861 is an apocalyptic number.

It is an amenable number.

168646861 is a deficient number, since it is larger than the sum of its proper divisors (6130259).

168646861 is an equidigital number, since it uses as much as digits as its factorization.

168646861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10523.

The product of its digits is 331776, while the sum is 46.

The square root of 168646861 is about 12986.4106280373. The cubic root of 168646861 is about 552.4921189406.

The spelling of 168646861 in words is "one hundred sixty-eight million, six hundred forty-six thousand, eight hundred sixty-one".