166666684859 has 2 divisors, whose sum is σ = 166666684860. Its totient is φ = 166666684858.

The previous prime is 166666684853. The next prime is 166666684871. The reversal of 166666684859 is 958486666661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166666684859 - 2¹⁶ = 166666619323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166666684792 and 166666684801.

It is not a weakly prime, because it can be changed into another prime (166666684853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333342429 + 83333342430.

It is an arithmetic number, because the mean of its divisors is an integer number (83333342430).

Almost surely, 2^166666684859 is an apocalyptic number.

166666684859 is a deficient number, since it is larger than the sum of its proper divisors (1).

166666684859 is an equidigital number, since it uses as much as digits as its factorization.

166666684859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 537477120, while the sum is 71.

The spelling of 166666684859 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-four thousand, eight hundred fifty-nine".