128166566 has 8 divisors (see below), whose sum is σ = 209727144. Its totient is φ = 58257520.

The previous prime is 128166529. The next prime is 128166569. The reversal of 128166566 is 665661821.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128166569) 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, 2912855 + ... + 2912898.

It is an arithmetic number, because the mean of its divisors is an integer number (26215893).

Almost surely, 2^128166566 is an apocalyptic number.

128166566 is a deficient number, since it is larger than the sum of its proper divisors (81560578).

128166566 is a wasteful number, since it uses less digits than its factorization.

128166566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5825766.

The product of its digits is 103680, while the sum is 41.

The square root of 128166566 is about 11321.0673525070. The cubic root of 128166566 is about 504.1869293801.

The spelling of 128166566 in words is "one hundred twenty-eight million, one hundred sixty-six thousand, five hundred sixty-six".