218566226 has 8 divisors (see below), whose sum is σ = 327912204. Its totient is φ = 109262160.

The previous prime is 218566207. The next prime is 218566237. The reversal of 218566226 is 622665812.

218566226 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 218005225 + 561001 = 14765^2 + 749^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 218566226.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13976 + ... + 25148.

Almost surely, 2^218566226 is an apocalyptic number.

218566226 is a deficient number, since it is larger than the sum of its proper divisors (109345978).

218566226 is a wasteful number, since it uses less digits than its factorization.

218566226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20956.

The product of its digits is 69120, while the sum is 38.

The square root of 218566226 is about 14783.9854572439. The cubic root of 218566226 is about 602.3667867765.

It can be divided in two parts, 21856 and 6226, that added together give a palindrome (28082).

The spelling of 218566226 in words is "two hundred eighteen million, five hundred sixty-six thousand, two hundred twenty-six".