218271689988 has 96 divisors (see below), whose sum is σ = 561167695872. Its totient is φ = 65481561600.

The previous prime is 218271689953. The next prime is 218271690067. The reversal of 218271689988 is 889986172812.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13580445 + ... + 13596507.

It is an arithmetic number, because the mean of its divisors is an integer number (5845496832).

Almost surely, 2^218271689988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218271689988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280583847936).

218271689988 is an abundant number, since it is smaller than the sum of its proper divisors (342896005884).

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

218271689988 is a wasteful number, since it uses less digits than its factorization.

218271689988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17105 (or 17103 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 69.

The spelling of 218271689988 in words is "two hundred eighteen billion, two hundred seventy-one million, six hundred eighty-nine thousand, nine hundred eighty-eight".