66221326 has 16 divisors (see below), whose sum is σ = 104297040. Its totient is φ = 31489920.

The previous prime is 66221317. The next prime is 66221329. The reversal of 66221326 is 62312266.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66221294 and 66221303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4635 + ... + 12406.

It is an arithmetic number, because the mean of its divisors is an integer number (6518565).

Almost surely, 2^66221326 is an apocalyptic number.

66221326 is a deficient number, since it is larger than the sum of its proper divisors (38075714).

66221326 is a wasteful number, since it uses less digits than its factorization.

66221326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17139.

The product of its digits is 5184, while the sum is 28.

The square root of 66221326 is about 8137.6486775972. The cubic root of 66221326 is about 404.5752311251.

The spelling of 66221326 in words is "sixty-six million, two hundred twenty-one thousand, three hundred twenty-six".