168672681 has 12 divisors (see below), whose sum is σ = 247768560. Its totient is φ = 110542200.

The previous prime is 168672667. The next prime is 168672737. The reversal of 168672681 is 186276861.

It is a happy number.

It is not a de Polignac number, because 168672681 - 2⁵ = 168672649 is a prime.

It is a super-2 number, since 2×168672681² = 56900946631455522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (168672601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158295 + ... + 159356.

It is an arithmetic number, because the mean of its divisors is an integer number (20647380).

Almost surely, 2^168672681 is an apocalyptic number.

It is an amenable number.

168672681 is a deficient number, since it is larger than the sum of its proper divisors (79095879).

168672681 is a wasteful number, since it uses less digits than its factorization.

168672681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317716 (or 317713 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 168672681 is about 12987.4047060989. The cubic root of 168672681 is about 552.5203131970.

The spelling of 168672681 in words is "one hundred sixty-eight million, six hundred seventy-two thousand, six hundred eighty-one".