218540244259 has 4 divisors (see below), whose sum is σ = 219238456216. Its totient is φ = 217842032304.

The previous prime is 218540244217. The next prime is 218540244271. The reversal of 218540244259 is 952442045812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 218540244259 - 2¹³ = 218540236067 is a prime.

It is a super-3 number, since 3×218540244259³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218540244059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349105509 + ... + 349106134.

It is an arithmetic number, because the mean of its divisors is an integer number (54809614054).

Almost surely, 2^218540244259 is an apocalyptic number.

218540244259 is a deficient number, since it is larger than the sum of its proper divisors (698211957).

218540244259 is an equidigital number, since it uses as much as digits as its factorization.

218540244259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698211956.

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 218540244259 in words is "two hundred eighteen billion, five hundred forty million, two hundred forty-four thousand, two hundred fifty-nine".