168065681 has 8 divisors (see below), whose sum is σ = 194942400. Its totient is φ = 141905808.

The previous prime is 168065641. The next prime is 168065687. The reversal of 168065681 is 186560861.

It is a happy number.

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 168065681 - 2⁶ = 168065617 is a prime.

It is a super-2 number, since 2×168065681² = 56492146259987522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168065687) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 178706 + ... + 179643.

It is an arithmetic number, because the mean of its divisors is an integer number (24367800).

Almost surely, 2^168065681 is an apocalyptic number.

It is an amenable number.

168065681 is a deficient number, since it is larger than the sum of its proper divisors (26876719).

168065681 is an equidigital number, since it uses as much as digits as its factorization.

168065681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358423.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 168065681 is about 12964.0148488036. The cubic root of 168065681 is about 551.8567342004.

The spelling of 168065681 in words is "one hundred sixty-eight million, sixty-five thousand, six hundred eighty-one".