2218665816 has 48 divisors (see below), whose sum is σ = 6231443400. Its totient is φ = 739554624.

The previous prime is 2218665791. The next prime is 2218665833. The reversal of 2218665816 is 6185668122.

2218665816 is a `hidden beast` number, since 2 + 2 + 1 + 8 + 66 + 581 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 568701 + ... + 572588.

Almost surely, 2^2218665816 is an apocalyptic number.

It is an amenable number.

2218665816 is an abundant number, since it is smaller than the sum of its proper divisors (4012777584).

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

2218665816 is a wasteful number, since it uses less digits than its factorization.

2218665816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141310 (or 1141294 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 2218665816 is about 47102.7155905050. The cubic root of 2218665816 is about 1304.2593657121.

The spelling of 2218665816 in words is "two billion, two hundred eighteen million, six hundred sixty-five thousand, eight hundred sixteen".