12226431661 has 2 divisors, whose sum is σ = 12226431662. Its totient is φ = 12226431660.

The previous prime is 12226431649. The next prime is 12226431683. The reversal of 12226431661 is 16613462221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11010514761 + 1215916900 = 104931^2 + 34870^2 .

It is an emirp because it is prime and its reverse (16613462221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12226431661 - 2⁷ = 12226431533 is a prime.

It is a super-2 number, since 2×12226431661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12226431611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6113215830 + 6113215831.

It is an arithmetic number, because the mean of its divisors is an integer number (6113215831).

Almost surely, 2^12226431661 is an apocalyptic number.

It is an amenable number.

12226431661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12226431661 is an equidigital number, since it uses as much as digits as its factorization.

12226431661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

Adding to 12226431661 its reverse (16613462221), we get a palindrome (28839893882).

The spelling of 12226431661 in words is "twelve billion, two hundred twenty-six million, four hundred thirty-one thousand, six hundred sixty-one".