218935688479 has 16 divisors (see below), whose sum is σ = 224131190400. Its totient is φ = 213791096736.

The previous prime is 218935688431. The next prime is 218935688501. The reversal of 218935688479 is 974886539812.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218935688479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218935688879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22489297 + ... + 22499029.

It is an arithmetic number, because the mean of its divisors is an integer number (14008199400).

Almost surely, 2^218935688479 is an apocalyptic number.

218935688479 is a deficient number, since it is larger than the sum of its proper divisors (5195501921).

218935688479 is a wasteful number, since it uses less digits than its factorization.

218935688479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12294.

The product of its digits is 209018880, while the sum is 70.

The spelling of 218935688479 in words is "two hundred eighteen billion, nine hundred thirty-five million, six hundred eighty-eight thousand, four hundred seventy-nine".