66221433 has 12 divisors (see below), whose sum is σ = 97458660. Its totient is φ = 43314336.

The previous prime is 66221399. The next prime is 66221497. The reversal of 66221433 is 33412266.

66221433 is a `hidden beast` number, since 6 + 6 + 221 + 433 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34715664 + 31505769 = 5892^2 + 5613^2 .

It is not a de Polignac number, because 66221433 - 2⁶ = 66221369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66221397 and 66221406.

It is not an unprimeable number, because it can be changed into a prime (66222433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68938 + ... + 69891.

It is an arithmetic number, because the mean of its divisors is an integer number (8121555).

Almost surely, 2^66221433 is an apocalyptic number.

It is an amenable number.

66221433 is a deficient number, since it is larger than the sum of its proper divisors (31237227).

66221433 is a wasteful number, since it uses less digits than its factorization.

66221433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138888 (or 138885 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 66221433 is about 8137.6552519752. The cubic root of 66221433 is about 404.5754490284.

Adding to 66221433 its reverse (33412266), we get a palindrome (99633699).

The spelling of 66221433 in words is "sixty-six million, two hundred twenty-one thousand, four hundred thirty-three".