12138109966 has 4 divisors (see below), whose sum is σ = 18207164952. Its totient is φ = 6069054982.

The previous prime is 12138109957. The next prime is 12138110009. The reversal of 12138109966 is 66990183121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66990183121 = 58771 ⋅1139851.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3034527490 + ... + 3034527493.

It is an arithmetic number, because the mean of its divisors is an integer number (4551791238).

Almost surely, 2^12138109966 is an apocalyptic number.

12138109966 is a deficient number, since it is larger than the sum of its proper divisors (6069054986).

12138109966 is an equidigital number, since it uses as much as digits as its factorization.

12138109966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6069054985.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 12138109966 in words is "twelve billion, one hundred thirty-eight million, one hundred nine thousand, nine hundred sixty-six".