12661107127 has 4 divisors (see below), whose sum is σ = 12696974640. Its totient is φ = 12625239616.

The previous prime is 12661107073. The next prime is 12661107133. The reversal of 12661107127 is 72170116621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72170116621 = 607 ⋅118896403.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12661107127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12661107092 and 12661107101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661107157) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 17933227 + ... + 17933932.

It is an arithmetic number, because the mean of its divisors is an integer number (3174243660).

Almost surely, 2^12661107127 is an apocalyptic number.

12661107127 is a deficient number, since it is larger than the sum of its proper divisors (35867513).

12661107127 is an equidigital number, since it uses as much as digits as its factorization.

12661107127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35867512.

The product of its (nonzero) digits is 7056, while the sum is 34.

The spelling of 12661107127 in words is "twelve billion, six hundred sixty-one million, one hundred seven thousand, one hundred twenty-seven".