218683516889 has 4 divisors (see below), whose sum is σ = 219828456960. Its totient is φ = 217538576820.

The previous prime is 218683516859. The next prime is 218683516903. The reversal of 218683516889 is 988615386812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218683516889 - 2¹² = 218683512793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218683516859) 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, 572469749 + ... + 572470130.

It is an arithmetic number, because the mean of its divisors is an integer number (54957114240).

Almost surely, 2^218683516889 is an apocalyptic number.

It is an amenable number.

218683516889 is a deficient number, since it is larger than the sum of its proper divisors (1144940071).

218683516889 is a wasteful number, since it uses less digits than its factorization.

218683516889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144940070.

The product of its digits is 39813120, while the sum is 65.

The spelling of 218683516889 in words is "two hundred eighteen billion, six hundred eighty-three million, five hundred sixteen thousand, eight hundred eighty-nine".