22218566 has 8 divisors (see below), whose sum is σ = 33393384. Its totient is φ = 11087440.

The previous prime is 22218557. The next prime is 22218569. The reversal of 22218566 is 66581222.

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 (22218569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9620 + ... + 11703.

It is an arithmetic number, because the mean of its divisors is an integer number (4174173).

Almost surely, 2^22218566 is an apocalyptic number.

22218566 is a deficient number, since it is larger than the sum of its proper divisors (11174818).

22218566 is a wasteful number, since it uses less digits than its factorization.

22218566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21846.

The product of its digits is 11520, while the sum is 32.

The square root of 22218566 is about 4713.6573910288. The cubic root of 22218566 is about 281.1288020353.

Adding to 22218566 its reverse (66581222), we get a palindrome (88799788).

The spelling of 22218566 in words is "twenty-two million, two hundred eighteen thousand, five hundred sixty-six".