218388231460 has 96 divisors (see below), whose sum is σ = 541260453888. Its totient is φ = 72430986240.

The previous prime is 218388231437. The next prime is 218388231511. The reversal of 218388231460 is 64132883812.

It is a self number, because there is not a number n which added to its sum of digits gives 218388231460.

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, 12303712 + ... + 12321448.

It is an arithmetic number, because the mean of its divisors is an integer number (5638129728).

Almost surely, 2^218388231460 is an apocalyptic number.

218388231460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218388231460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270630226944).

218388231460 is an abundant number, since it is smaller than the sum of its proper divisors (322872222428).

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

218388231460 is a wasteful number, since it uses less digits than its factorization.

218388231460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20621 (or 20619 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 218388231460 in words is "two hundred eighteen billion, three hundred eighty-eight million, two hundred thirty-one thousand, four hundred sixty".