218563340689 has 24 divisors (see below), whose sum is σ = 230206738176. Its totient is φ = 207114969600.

The previous prime is 218563340657. The next prime is 218563340707. The reversal of 218563340689 is 986043365812.

It is not a de Polignac number, because 218563340689 - 2⁵ = 218563340657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218563340089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324759457 + ... + 324760129.

It is an arithmetic number, because the mean of its divisors is an integer number (9591947424).

Almost surely, 2^218563340689 is an apocalyptic number.

It is an amenable number.

218563340689 is a deficient number, since it is larger than the sum of its proper divisors (11643397487).

218563340689 is an equidigital number, since it uses as much as digits as its factorization.

218563340689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 55.

The spelling of 218563340689 in words is "two hundred eighteen billion, five hundred sixty-three million, three hundred forty thousand, six hundred eighty-nine".