12126516877 has 4 divisors (see below), whose sum is σ = 12203755996. Its totient is φ = 12049277760.

The previous prime is 12126516841. The next prime is 12126516881. The reversal of 12126516877 is 77861562121.

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 6520401001 + 5606115876 = 80749^2 + 74874^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12126516877 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 (12126546877) 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, 38619324 + ... + 38619637.

It is an arithmetic number, because the mean of its divisors is an integer number (3050938999).

Almost surely, 2^12126516877 is an apocalyptic number.

It is an amenable number.

12126516877 is a deficient number, since it is larger than the sum of its proper divisors (77239119).

12126516877 is an equidigital number, since it uses as much as digits as its factorization.

12126516877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77239118.

The product of its digits is 282240, while the sum is 46.

The spelling of 12126516877 in words is "twelve billion, one hundred twenty-six million, five hundred sixteen thousand, eight hundred seventy-seven".