218554795872 has 72 divisors (see below), whose sum is σ = 710303093136. Its totient is φ = 62444226816.

The previous prime is 218554795841. The next prime is 218554795873. The reversal of 218554795872 is 278597455812.

218554795872 is a `hidden beast` number, since 2 + 1 + 8 + 5 + 5 + 47 + 9 + 587 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218554795873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54203043 + ... + 54207074.

It is an arithmetic number, because the mean of its divisors is an integer number (9865320738).

Almost surely, 2^218554795872 is an apocalyptic number.

It is an amenable number.

218554795872 is an abundant number, since it is smaller than the sum of its proper divisors (491748297264).

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

218554795872 is a wasteful number, since it uses less digits than its factorization.

218554795872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108410140 (or 108410129 counting only the distinct ones).

The product of its digits is 56448000, while the sum is 63.

The spelling of 218554795872 in words is "two hundred eighteen billion, five hundred fifty-four million, seven hundred ninety-five thousand, eight hundred seventy-two".