168640061667 has 32 divisors (see below), whose sum is σ = 280403735040. Its totient is φ = 87584286720.

The previous prime is 168640061651. The next prime is 168640061669. The reversal of 168640061667 is 766160046861.

168640061667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 168640061667 - 2⁴ = 168640061651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168640061669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 905653 + ... + 1075865.

It is an arithmetic number, because the mean of its divisors is an integer number (8762616720).

Almost surely, 2^168640061667 is an apocalyptic number.

168640061667 is a deficient number, since it is larger than the sum of its proper divisors (111763673373).

168640061667 is a wasteful number, since it uses less digits than its factorization.

168640061667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174523.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 168640061667 in words is "one hundred sixty-eight billion, six hundred forty million, sixty-one thousand, six hundred sixty-seven".