218115516 has 48 divisors (see below), whose sum is σ = 539100800. Its totient is φ = 68444352.

The previous prime is 218115487. The next prime is 218115533. The reversal of 218115516 is 615511812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34230 + ... + 40098.

Almost surely, 2^218115516 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 218115516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269550400).

218115516 is an abundant number, since it is smaller than the sum of its proper divisors (320985284).

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

218115516 is a wasteful number, since it uses less digits than its factorization.

218115516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6058 (or 6056 counting only the distinct ones).

The product of its digits is 2400, while the sum is 30.

The square root of 218115516 is about 14768.7344075246. The cubic root of 218115516 is about 601.9524507795.

The spelling of 218115516 in words is "two hundred eighteen million, one hundred fifteen thousand, five hundred sixteen".