218236656 has 80 divisors (see below), whose sum is σ = 631709568. Its totient is φ = 64339200.

The previous prime is 218236643. The next prime is 218236657. The reversal of 218236656 is 656632812.

218236656 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218236657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13951 + ... + 25121.

Almost surely, 2^218236656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218236656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315854784).

218236656 is an abundant number, since it is smaller than the sum of its proper divisors (413472912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218236656 is a wasteful number, since it uses less digits than its factorization.

218236656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11230 (or 11224 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 218236656 is about 14772.8350698165. The cubic root of 218236656 is about 602.0638703696.

The spelling of 218236656 in words is "two hundred eighteen million, two hundred thirty-six thousand, six hundred fifty-six".