218424218256 has 30 divisors (see below), whose sum is σ = 611284444550. Its totient is φ = 72808072704.

The previous prime is 218424218251. The next prime is 218424218261. The reversal of 218424218256 is 652812424812.

It is a happy number.

218424218256 is a `hidden beast` number, since 2 + 1 + 8 + 424 + 218 + 2 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (218424218251) and next prime (218424218261).

It can be written as a sum of positive squares in only one way, i.e., 218260889856 + 163328400 = 467184^2 + 12780^2 .

It is not an unprimeable number, because it can be changed into a prime (218424218251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 758417281 + ... + 758417568.

Almost surely, 2^218424218256 is an apocalyptic number.

It is an amenable number.

218424218256 is an abundant number, since it is smaller than the sum of its proper divisors (392860226294).

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

218424218256 is a wasteful number, since it uses less digits than its factorization.

218424218256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516834863 (or 1516834854 counting only the distinct ones).

The product of its digits is 491520, while the sum is 45.

The spelling of 218424218256 in words is "two hundred eighteen billion, four hundred twenty-four million, two hundred eighteen thousand, two hundred fifty-six".