223218201816 has 64 divisors (see below), whose sum is σ = 624511440000. Its totient is φ = 73870761888.

The previous prime is 223218201793. The next prime is 223218201883. The reversal of 223218201816 is 618102812322.

It is a happy number.

223218201816 is a `hidden beast` number, since 223 + 218 + 201 + 8 + 16 = 666.

It is a super-3 number, since 3×223218201816³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3687306 + ... + 3747353.

It is an arithmetic number, because the mean of its divisors is an integer number (9757991250).

Almost surely, 2^223218201816 is an apocalyptic number.

It is an amenable number.

223218201816 is an abundant number, since it is smaller than the sum of its proper divisors (401293238184).

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

223218201816 is a wasteful number, since it uses less digits than its factorization.

223218201816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7434813 (or 7434803 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 223218201816 in words is "two hundred twenty-three billion, two hundred eighteen million, two hundred one thousand, eight hundred sixteen".