2216555781888 has 144 divisors (see below), whose sum is σ = 6924241318400. Its totient is φ = 616185335808.

The previous prime is 2216555781857. The next prime is 2216555781907. The reversal of 2216555781888 is 8881875556122.

It is a super-2 number, since 2×2216555781888² (a number of 25 digits) contains 22 as substring.

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, 5372788 + ... + 5770611.

Almost surely, 2^{2216555781888} is an apocalyptic number.

2216555781888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2216555781888 is an abundant number, since it is smaller than the sum of its proper divisors (4707685536512).

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

2216555781888 is a wasteful number, since it uses less digits than its factorization.

2216555781888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11143462 (or 11143448 counting only the distinct ones).

The product of its digits is 86016000, while the sum is 66.

The spelling of 2216555781888 in words is "two trillion, two hundred sixteen billion, five hundred fifty-five million, seven hundred eighty-one thousand, eight hundred eighty-eight".