166666684841 has 2 divisors, whose sum is σ = 166666684842. Its totient is φ = 166666684840.

The previous prime is 166666684817. The next prime is 166666684853. The reversal of 166666684841 is 148486666661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131028796441 + 35637888400 = 361979^2 + 188780^2 .

It is a cyclic number.

It is not a de Polignac number, because 166666684841 - 2²⁶ = 166599575977 is a prime.

It is not a weakly prime, because it can be changed into another prime (166666684871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333342420 + 83333342421.

It is an arithmetic number, because the mean of its divisors is an integer number (83333342421).

Almost surely, 2^166666684841 is an apocalyptic number.

It is an amenable number.

166666684841 is a deficient number, since it is larger than the sum of its proper divisors (1).

166666684841 is an equidigital number, since it uses as much as digits as its factorization.

166666684841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47775744, while the sum is 62.

The spelling of 166666684841 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-four thousand, eight hundred forty-one".