12127958709 has 4 divisors (see below), whose sum is σ = 16170611616. Its totient is φ = 8085305804.

The previous prime is 12127958707. The next prime is 12127958747. The reversal of 12127958709 is 90785972121.

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 not a de Polignac number, because 12127958709 - 2¹ = 12127958707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12127958707) 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, 2021326449 + ... + 2021326454.

It is an arithmetic number, because the mean of its divisors is an integer number (4042652904).

Almost surely, 2^12127958709 is an apocalyptic number.

It is an amenable number.

12127958709 is a deficient number, since it is larger than the sum of its proper divisors (4042652907).

12127958709 is an equidigital number, since it uses as much as digits as its factorization.

12127958709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042652906.

The product of its (nonzero) digits is 635040, while the sum is 51.

The spelling of 12127958709 in words is "twelve billion, one hundred twenty-seven million, nine hundred fifty-eight thousand, seven hundred nine".