2216220666 has 16 divisors (see below), whose sum is σ = 4835390688. Its totient is φ = 671582000.

The previous prime is 2216220619. The next prime is 2216220673. The reversal of 2216220666 is 6660226122.

2216220666 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 16789485 + ... + 16789616.

It is an arithmetic number, because the mean of its divisors is an integer number (302211918).

Almost surely, 2^2216220666 is an apocalyptic number.

2216220666 is an abundant number, since it is smaller than the sum of its proper divisors (2619170022).

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

2216220666 is a wasteful number, since it uses less digits than its factorization.

2216220666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33579117.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 2216220666 is about 47076.7529254089. The cubic root of 2216220666 is about 1303.7800563248.

Adding to 2216220666 its reverse (6660226122), we get a palindrome (8876446788).

The spelling of 2216220666 in words is "two billion, two hundred sixteen million, two hundred twenty thousand, six hundred sixty-six".