218161818216 has 96 divisors (see below), whose sum is σ = 592657752960. Its totient is φ = 72499021056.

The previous prime is 218161818191. The next prime is 218161818257. The reversal of 218161818216 is 612818161812.

218161818216 is a `hidden beast` number, since 2 + 1 + 8 + 1 + 618 + 1 + 8 + 21 + 6 = 666.

218161818216 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×218161818216² (a number of 23 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50768580 + ... + 50772876.

It is an arithmetic number, because the mean of its divisors is an integer number (6173518260).

Almost surely, 2^218161818216 is an apocalyptic number.

It is an amenable number.

218161818216 is an abundant number, since it is smaller than the sum of its proper divisors (374495934744).

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

218161818216 is a wasteful number, since it uses less digits than its factorization.

218161818216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295 (or 6288 counting only the distinct ones).

The product of its digits is 73728, while the sum is 45.

The spelling of 218161818216 in words is "two hundred eighteen billion, one hundred sixty-one million, eight hundred eighteen thousand, two hundred sixteen".