12127735877 has 4 divisors (see below), whose sum is σ = 12127984140. Its totient is φ = 12127487616.

The previous prime is 12127735871. The next prime is 12127735901. The reversal of 12127735877 is 77853772121.

It is a Cunningham number, because it is equal to 110126²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77853772121 = 119237 ⋅652933.

It can be written as a sum of positive squares in 2 ways, for example, as 11918962276 + 208773601 = 109174^2 + 14449^2 .

It is a cyclic number.

It is not a de Polignac number, because 12127735877 - 2⁶ = 12127735813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12127735871) 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, 23852 + ... + 157557.

It is an arithmetic number, because the mean of its divisors is an integer number (3031996035).

Almost surely, 2^12127735877 is an apocalyptic number.

It is an amenable number.

12127735877 is a deficient number, since it is larger than the sum of its proper divisors (248263).

12127735877 is an equidigital number, since it uses as much as digits as its factorization.

12127735877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248262.

The product of its digits is 1152480, while the sum is 50.

The spelling of 12127735877 in words is "twelve billion, one hundred twenty-seven million, seven hundred thirty-five thousand, eight hundred seventy-seven".