2216715666 has 64 divisors (see below), whose sum is σ = 5061381120. Its totient is φ = 640664640.

The previous prime is 2216715647. The next prime is 2216715701. The reversal of 2216715666 is 6665176122.

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, 573396 + ... + 577248.

It is an arithmetic number, because the mean of its divisors is an integer number (79084080).

Almost surely, 2^2216715666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2216715666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2530690560).

2216715666 is an abundant number, since it is smaller than the sum of its proper divisors (2844665454).

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

2216715666 is a wasteful number, since it uses less digits than its factorization.

2216715666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271.

The product of its digits is 181440, while the sum is 42.

The square root of 2216715666 is about 47082.0100038221. The cubic root of 2216715666 is about 1303.8771169192.

The spelling of 2216715666 in words is "two billion, two hundred sixteen million, seven hundred fifteen thousand, six hundred sixty-six".