166666128 has 20 divisors (see below), whose sum is σ = 430554288. Its totient is φ = 55555360.

The previous prime is 166666127. The next prime is 166666133. The reversal of 166666128 is 821666661.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 166666128.

It is not an unprimeable number, because it can be changed into a prime (166666121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1736058 + ... + 1736153.

Almost surely, 2^166666128 is an apocalyptic number.

It is an amenable number.

166666128 is an abundant number, since it is smaller than the sum of its proper divisors (263888160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166666128 is a wasteful number, since it uses less digits than its factorization.

166666128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3472222 (or 3472216 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 166666128 is about 12909.9236248709. The cubic root of 166666128 is about 550.3206152691.

The spelling of 166666128 in words is "one hundred sixty-six million, six hundred sixty-six thousand, one hundred twenty-eight".