166666923 has 16 divisors (see below), whose sum is σ = 247730560. Its totient is φ = 110743848.

The previous prime is 166666921. The next prime is 166666937. The reversal of 166666923 is 329666661.

It is not a de Polignac number, because 166666923 - 2¹ = 166666921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166666921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1765 + ... + 18342.

It is an arithmetic number, because the mean of its divisors is an integer number (15483160).

Almost surely, 2^166666923 is an apocalyptic number.

166666923 is a deficient number, since it is larger than the sum of its proper divisors (81063637).

166666923 is a wasteful number, since it uses less digits than its factorization.

166666923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20423 (or 20417 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 166666923 is about 12909.9544151015. The cubic root of 166666923 is about 550.3214902803.

The spelling of 166666923 in words is "one hundred sixty-six million, six hundred sixty-six thousand, nine hundred twenty-three".