12226325561 has 4 divisors (see below), whose sum is σ = 12869816400. Its totient is φ = 11582834724.

The previous prime is 12226325539. The next prime is 12226325567. The reversal of 12226325561 is 16552362221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16552362221 = 19 ⋅871176959.

It is a cyclic number.

It is not a de Polignac number, because 12226325561 - 2⁶ = 12226325497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12226325567) 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, 321745391 + ... + 321745428.

It is an arithmetic number, because the mean of its divisors is an integer number (3217454100).

Almost surely, 2^12226325561 is an apocalyptic number.

It is an amenable number.

12226325561 is a deficient number, since it is larger than the sum of its proper divisors (643490839).

12226325561 is an equidigital number, since it uses as much as digits as its factorization.

12226325561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643490838.

The product of its digits is 43200, while the sum is 35.

Adding to 12226325561 its reverse (16552362221), we get a palindrome (28778687782).

The spelling of 12226325561 in words is "twelve billion, two hundred twenty-six million, three hundred twenty-five thousand, five hundred sixty-one".