166666851685 has 32 divisors (see below), whose sum is σ = 210297364992. Its totient is φ = 126643668480.

The previous prime is 166666851679. The next prime is 166666851707. The reversal of 166666851685 is 586158666661.

It is not a de Polignac number, because 166666851685 - 2⁷ = 166666851557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18188505 + ... + 18197665.

It is an arithmetic number, because the mean of its divisors is an integer number (6571792656).

Almost surely, 2^166666851685 is an apocalyptic number.

It is an amenable number.

166666851685 is a deficient number, since it is larger than the sum of its proper divisors (43630513307).

166666851685 is a wasteful number, since it uses less digits than its factorization.

166666851685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11533.

The product of its digits is 74649600, while the sum is 64.

The spelling of 166666851685 in words is "one hundred sixty-six billion, six hundred sixty-six million, eight hundred fifty-one thousand, six hundred eighty-five".