218505697220 has 12 divisors (see below), whose sum is σ = 458861964204. Its totient is φ = 87402278880.

The previous prime is 218505697139. The next prime is 218505697273. The reversal of 218505697220 is 22796505812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26060290624 + 192445406596 = 161432^2 + 438686^2 .

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 3 ways as a sum of consecutive naturals, for example, 5462642411 + ... + 5462642450.

It is an arithmetic number, because the mean of its divisors is an integer number (38238497017).

Almost surely, 2^218505697220 is an apocalyptic number.

218505697220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218505697220 is an abundant number, since it is smaller than the sum of its proper divisors (240356266984).

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

218505697220 is a wasteful number, since it uses less digits than its factorization.

218505697220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10925284870 (or 10925284868 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 218505697220 in words is "two hundred eighteen billion, five hundred five million, six hundred ninety-seven thousand, two hundred twenty".