12166523266 has 4 divisors (see below), whose sum is σ = 18249784902. Its totient is φ = 6083261632.

The previous prime is 12166523231. The next prime is 12166523351. The reversal of 12166523266 is 66232566121.

It is a happy number.

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., 11539271241 + 627252025 = 107421^2 + 25045^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3041630815 + ... + 3041630818.

Almost surely, 2^12166523266 is an apocalyptic number.

12166523266 is a deficient number, since it is larger than the sum of its proper divisors (6083261636).

12166523266 is an equidigital number, since it uses as much as digits as its factorization.

12166523266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083261635.

The product of its digits is 155520, while the sum is 40.

The spelling of 12166523266 in words is "twelve billion, one hundred sixty-six million, five hundred twenty-three thousand, two hundred sixty-six".