166666851684 has 36 divisors (see below), whose sum is σ = 446078928204. Its totient is φ = 52287639552.

The previous prime is 166666851679. The next prime is 166666851707. The reversal of 166666851684 is 486158666661.

166666851684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 63579622500 + 103087229184 = 252150^2 + 321072^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 136165117 + ... + 136166340.

It is an arithmetic number, because the mean of its divisors is an integer number (12391081339).

Almost surely, 2^166666851684 is an apocalyptic number.

It is an amenable number.

166666851684 is an abundant number, since it is smaller than the sum of its proper divisors (279412076520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166666851684 is a wasteful number, since it uses less digits than its factorization.

166666851684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272331484 (or 272331479 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

The spelling of 166666851684 in words is "one hundred sixty-six billion, six hundred sixty-six million, eight hundred fifty-one thousand, six hundred eighty-four".