12105311266 has 4 divisors (see below), whose sum is σ = 18157966902. Its totient is φ = 6052655632.

The previous prime is 12105311249. The next prime is 12105311279. The reversal of 12105311266 is 66211350121.

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

It can be written as a sum of positive squares in only one way, i.e., 7505623225 + 4599688041 = 86635^2 + 67821^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3026327815 + ... + 3026327818.

Almost surely, 2^12105311266 is an apocalyptic number.

12105311266 is a deficient number, since it is larger than the sum of its proper divisors (6052655636).

12105311266 is an equidigital number, since it uses as much as digits as its factorization.

12105311266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6052655635.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 12105311266 its reverse (66211350121), we get a palindrome (78316661387).

The spelling of 12105311266 in words is "twelve billion, one hundred five million, three hundred eleven thousand, two hundred sixty-six".