2216220656 has 40 divisors (see below), whose sum is σ = 4641411264. Its totient is φ = 1019070720.

The previous prime is 2216220619. The next prime is 2216220673. The reversal of 2216220656 is 6560226122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36710 + ... + 76026.

Almost surely, 2^2216220656 is an apocalyptic number.

2216220656 is a gapful number since it is divisible by the number (26) 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 2216220656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2320705632).

2216220656 is an abundant number, since it is smaller than the sum of its proper divisors (2425190608).

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

2216220656 is a wasteful number, since it uses less digits than its factorization.

2216220656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39609 (or 39603 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 2216220656 is about 47076.7528191994. The cubic root of 2216220656 is about 1303.7800543638.

Adding to 2216220656 its reverse (6560226122), we get a palindrome (8776446778).

The spelling of 2216220656 in words is "two billion, two hundred sixteen million, two hundred twenty thousand, six hundred fifty-six".