166728123 has 12 divisors (see below), whose sum is σ = 241453680. Its totient is φ = 110864016.

The previous prime is 166728113. The next prime is 166728139. The reversal of 166728123 is 321827661.

166728123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166728123 - 2⁵ = 166728091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166728113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20311 + ... + 27312.

It is an arithmetic number, because the mean of its divisors is an integer number (20121140).

Almost surely, 2^166728123 is an apocalyptic number.

166728123 is a deficient number, since it is larger than the sum of its proper divisors (74725557).

166728123 is a wasteful number, since it uses less digits than its factorization.

166728123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48018 (or 48015 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 166728123 is about 12912.3244615367. The cubic root of 166728123 is about 550.3888412840.

The spelling of 166728123 in words is "one hundred sixty-six million, seven hundred twenty-eight thousand, one hundred twenty-three".