218540244260 has 72 divisors (see below), whose sum is σ = 509073878376. Its totient is φ = 78723640320.

The previous prime is 218540244217. The next prime is 218540244271. The reversal of 218540244260 is 62442045812.

It can be written as a sum of positive squares in 12 ways, for example, as 191472755776 + 27067488484 = 437576^2 + 164522^2 .

It is a super-2 number, since 2×218540244260² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 649919 + ... + 927078.

It is an arithmetic number, because the mean of its divisors is an integer number (7070470533).

Almost surely, 2^218540244260 is an apocalyptic number.

218540244260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218540244260 is an abundant number, since it is smaller than the sum of its proper divisors (290533634116).

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

218540244260 is a wasteful number, since it uses less digits than its factorization.

218540244260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577073 (or 1577058 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 38.

The spelling of 218540244260 in words is "two hundred eighteen billion, five hundred forty million, two hundred forty-four thousand, two hundred sixty".