66221233 has 4 divisors (see below), whose sum is σ = 71315188. Its totient is φ = 61127280.

The previous prime is 66221227. The next prime is 66221237. The reversal of 66221233 is 33212266.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8111104 + 58110129 = 2848^2 + 7623^2 .

It is a cyclic number.

It is not a de Polignac number, because 66221233 - 2²⁵ = 32666801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66221198 and 66221207.

It is not an unprimeable number, because it can be changed into a prime (66221237) 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, 2546958 + ... + 2546983.

It is an arithmetic number, because the mean of its divisors is an integer number (17828797).

Almost surely, 2^66221233 is an apocalyptic number.

It is an amenable number.

66221233 is a deficient number, since it is larger than the sum of its proper divisors (5093955).

66221233 is a wasteful number, since it uses less digits than its factorization.

66221233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5093954.

The product of its digits is 2592, while the sum is 25.

The square root of 66221233 is about 8137.6429634139. The cubic root of 66221233 is about 404.5750417324.

Adding to 66221233 its reverse (33212266), we get a palindrome (99433499).

The spelling of 66221233 in words is "sixty-six million, two hundred twenty-one thousand, two hundred thirty-three".