166666684871 has 2 divisors, whose sum is σ = 166666684872. Its totient is φ = 166666684870.

The previous prime is 166666684859. The next prime is 166666684907. The reversal of 166666684871 is 178486666661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166666684871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166666684798 and 166666684807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166666684841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333342435 + 83333342436.

It is an arithmetic number, because the mean of its divisors is an integer number (83333342436).

Almost surely, 2^166666684871 is an apocalyptic number.

166666684871 is a deficient number, since it is larger than the sum of its proper divisors (1).

166666684871 is an equidigital number, since it uses as much as digits as its factorization.

166666684871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 83607552, while the sum is 65.

The spelling of 166666684871 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-four thousand, eight hundred seventy-one".