166641666289 has 8 divisors (see below), whose sum is σ = 191171756160. Its totient is φ = 142292610816.

The previous prime is 166641666253. The next prime is 166641666311. The reversal of 166641666289 is 982666146661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166641666289 - 2⁷ = 166641666161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166641666089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45256624 + ... + 45260305.

It is an arithmetic number, because the mean of its divisors is an integer number (23896469520).

Almost surely, 2^166641666289 is an apocalyptic number.

It is an amenable number.

166641666289 is a deficient number, since it is larger than the sum of its proper divisors (24530089871).

166641666289 is an equidigital number, since it uses as much as digits as its factorization.

166641666289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90517199.

The product of its digits is 26873856, while the sum is 61.

The spelling of 166641666289 in words is "one hundred sixty-six billion, six hundred forty-one million, six hundred sixty-six thousand, two hundred eighty-nine".