12163891609 has 4 divisors (see below), whose sum is σ = 12168255780. Its totient is φ = 12159527440.

The previous prime is 12163891583. The next prime is 12163891627. The reversal of 12163891609 is 90619836121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9626553225 + 2537338384 = 98115^2 + 50372^2 .

It is a cyclic number.

It is not a de Polignac number, because 12163891609 - 2²⁷ = 12029673881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12163891709) 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, 2177902 + ... + 2183479.

It is an arithmetic number, because the mean of its divisors is an integer number (3042063945).

Almost surely, 2^12163891609 is an apocalyptic number.

It is an amenable number.

12163891609 is a deficient number, since it is larger than the sum of its proper divisors (4364171).

12163891609 is an equidigital number, since it uses as much as digits as its factorization.

12163891609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364170.

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

The spelling of 12163891609 in words is "twelve billion, one hundred sixty-three million, eight hundred ninety-one thousand, six hundred nine".