12135273126161 has 4 divisors (see below), whose sum is σ = 12139080871152. Its totient is φ = 12131465381172.

The previous prime is 12135273126121. The next prime is 12135273126187. The reversal of 12135273126161 is 16162137253121.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12135273126161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12135273126121) 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, 1903867715 + ... + 1903874088.

It is an arithmetic number, because the mean of its divisors is an integer number (3034770217788).

Almost surely, 2^{12135273126161} is an apocalyptic number.

It is an amenable number.

12135273126161 is a deficient number, since it is larger than the sum of its proper divisors (3807744991).

12135273126161 is an equidigital number, since it uses as much as digits as its factorization.

12135273126161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3807744990.

The product of its digits is 90720, while the sum is 41.

The spelling of 12135273126161 in words is "twelve trillion, one hundred thirty-five billion, two hundred seventy-three million, one hundred twenty-six thousand, one hundred sixty-one".