168685006681 has 16 divisors (see below), whose sum is σ = 171435692160. Its totient is φ = 165956947200.

The previous prime is 168685006669. The next prime is 168685006687. The reversal of 168685006681 is 186600586861.

It is a cyclic number.

It is not a de Polignac number, because 168685006681 - 2¹¹ = 168685004633 is a prime.

It is a super-2 number, since 2×168685006681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168685006687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32232241 + ... + 32237473.

It is an arithmetic number, because the mean of its divisors is an integer number (10714730760).

Almost surely, 2^168685006681 is an apocalyptic number.

It is an amenable number.

168685006681 is a deficient number, since it is larger than the sum of its proper divisors (2750685479).

168685006681 is a wasteful number, since it uses less digits than its factorization.

168685006681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 168685006681 in words is "one hundred sixty-eight billion, six hundred eighty-five million, six thousand, six hundred eighty-one".