2216533661 has 8 divisors (see below), whose sum is σ = 2355583104. Its totient is φ = 2078447040.

The previous prime is 2216533651. The next prime is 2216533679. The reversal of 2216533661 is 1663356122.

2216533661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2216533661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216533651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235955 + ... + 245168.

It is an arithmetic number, because the mean of its divisors is an integer number (294447888).

Almost surely, 2^2216533661 is an apocalyptic number.

It is an amenable number.

2216533661 is a deficient number, since it is larger than the sum of its proper divisors (139049443).

2216533661 is a wasteful number, since it uses less digits than its factorization.

2216533661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481411.

The product of its digits is 38880, while the sum is 35.

The square root of 2216533661 is about 47080.0771133608. The cubic root of 2216533661 is about 1303.8414306930.

Adding to 2216533661 its reverse (1663356122), we get a palindrome (3879889783).

The spelling of 2216533661 in words is "two billion, two hundred sixteen million, five hundred thirty-three thousand, six hundred sixty-one".