12216224665 has 32 divisors (see below), whose sum is σ = 15091466400. Its totient is φ = 9489352704.

The previous prime is 12216224663. The next prime is 12216224711. The reversal of 12216224665 is 56642261221.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 891136 + 12215333529 = 944^2 + 110523^2 .

It is a cyclic number.

It is not a de Polignac number, because 12216224665 - 2¹ = 12216224663 is a prime.

It is a super-2 number, since 2×12216224665² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12216224663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18044307 + ... + 18044983.

It is an arithmetic number, because the mean of its divisors is an integer number (471608325).

Almost surely, 2^12216224665 is an apocalyptic number.

It is an amenable number.

12216224665 is a deficient number, since it is larger than the sum of its proper divisors (2875241735).

12216224665 is a wasteful number, since it uses less digits than its factorization.

12216224665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341.

The product of its digits is 69120, while the sum is 37.

Adding to 12216224665 its reverse (56642261221), we get a palindrome (68858485886).

The spelling of 12216224665 in words is "twelve billion, two hundred sixteen million, two hundred twenty-four thousand, six hundred sixty-five".