2216533645 has 4 divisors (see below), whose sum is σ = 2659840380. Its totient is φ = 1773226912.

The previous prime is 2216533643. The next prime is 2216533651. The reversal of 2216533645 is 5463356122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1645275844 + 571257801 = 40562^2 + 23901^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216533645 - 2¹ = 2216533643 is a prime.

It is a super-3 number, since 3×2216533645³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216533643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221653360 + ... + 221653369.

It is an arithmetic number, because the mean of its divisors is an integer number (664960095).

Almost surely, 2^2216533645 is an apocalyptic number.

It is an amenable number.

2216533645 is a deficient number, since it is larger than the sum of its proper divisors (443306735).

2216533645 is an equidigital number, since it uses as much as digits as its factorization.

2216533645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443306734.

The product of its digits is 129600, while the sum is 37.

The square root of 2216533645 is about 47080.0769434375. The cubic root of 2216533645 is about 1303.8414275557.

Adding to 2216533645 its reverse (5463356122), we get a palindrome (7679889767).

The spelling of 2216533645 in words is "two billion, two hundred sixteen million, five hundred thirty-three thousand, six hundred forty-five".