16566433128 has 72 divisors (see below), whose sum is σ = 52192727730. Its totient is φ = 4733265600.

The previous prime is 16566433109. The next prime is 16566433153. The reversal of 16566433128 is 82133466561.

16566433128 is a `hidden beast` number, since 16 + 566 + 43 + 31 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15654513924 + 911919204 = 125118^2 + 30198^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2344323 + ... + 2351378.

Almost surely, 2^16566433128 is an apocalyptic number.

16566433128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16566433128 is an abundant number, since it is smaller than the sum of its proper divisors (35626294602).

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

16566433128 is a wasteful number, since it uses less digits than its factorization.

16566433128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4695727 (or 4695713 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

Adding to 16566433128 its reverse (82133466561), we get a palindrome (98699899689).

It can be divided in two parts, 16566433 and 128, that added together give a palindrome (16566561).

The spelling of 16566433128 in words is "sixteen billion, five hundred sixty-six million, four hundred thirty-three thousand, one hundred twenty-eight".