166666684907 has 2 divisors, whose sum is σ = 166666684908. Its totient is φ = 166666684906.

The previous prime is 166666684871. The next prime is 166666684927. The reversal of 166666684907 is 709486666661.

It is a strong prime.

It is an emirp because it is prime and its reverse (709486666661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166666684907 - 2¹⁴ = 166666668523 is a prime.

It is not a weakly prime, because it can be changed into another prime (166666684927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333342453 + 83333342454.

It is an arithmetic number, because the mean of its divisors is an integer number (83333342454).

Almost surely, 2^166666684907 is an apocalyptic number.

166666684907 is a deficient number, since it is larger than the sum of its proper divisors (1).

166666684907 is an equidigital number, since it uses as much as digits as its factorization.

166666684907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94058496, while the sum is 65.

The spelling of 166666684907 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-four thousand, nine hundred seven".