166116566 has 24 divisors (see below), whose sum is σ = 316209096. Its totient is φ = 64720320.

The previous prime is 166116541. The next prime is 166116589. The reversal of 166116566 is 665611661.

It is a happy number.

166116566 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75971 + ... + 78126.

It is an arithmetic number, because the mean of its divisors is an integer number (13175379).

Almost surely, 2^166116566 is an apocalyptic number.

166116566 is a deficient number, since it is larger than the sum of its proper divisors (150092530).

166116566 is a wasteful number, since it uses less digits than its factorization.

166116566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154124 (or 154117 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 166116566 is about 12888.6215709827. The cubic root of 166116566 is about 549.7150766655.

The spelling of 166116566 in words is "one hundred sixty-six million, one hundred sixteen thousand, five hundred sixty-six".