128566163 has 4 divisors (see below), whose sum is σ = 140254008. Its totient is φ = 116878320.

The previous prime is 128566127. The next prime is 128566169. The reversal of 128566163 is 361665821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 361665821 = 11 ⋅32878711.

It is a cyclic number.

It is not a de Polignac number, because 128566163 - 2¹⁶ = 128500627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128566169) 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, 5843906 + ... + 5843927.

It is an arithmetic number, because the mean of its divisors is an integer number (35063502).

Almost surely, 2^128566163 is an apocalyptic number.

128566163 is a deficient number, since it is larger than the sum of its proper divisors (11687845).

128566163 is a wasteful number, since it uses less digits than its factorization.

128566163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11687844.

The product of its digits is 51840, while the sum is 38.

The square root of 128566163 is about 11338.7019980243. The cubic root of 128566163 is about 504.7103694896.

The spelling of 128566163 in words is "one hundred twenty-eight million, five hundred sixty-six thousand, one hundred sixty-three".