66221222 has 8 divisors (see below), whose sum is σ = 105174936. Its totient is φ = 31162912.

The previous prime is 66221219. The next prime is 66221227. The reversal of 66221222 is 22212266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221227) 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, 973808 + ... + 973875.

It is an arithmetic number, because the mean of its divisors is an integer number (13146867).

Almost surely, 2^66221222 is an apocalyptic number.

66221222 is a deficient number, since it is larger than the sum of its proper divisors (38953714).

66221222 is a wasteful number, since it uses less digits than its factorization.

66221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947702.

The product of its digits is 1152, while the sum is 23.

The square root of 66221222 is about 8137.6422875425. The cubic root of 66221222 is about 404.5750193311.

Adding to 66221222 its reverse (22212266), we get a palindrome (88433488).

The spelling of 66221222 in words is "sixty-six million, two hundred twenty-one thousand, two hundred twenty-two".