12187878827 has 4 divisors (see below), whose sum is σ = 12196011000. Its totient is φ = 12179746656.

The previous prime is 12187878809. The next prime is 12187878841. The reversal of 12187878827 is 72887878121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72887878121 = 2503 ⋅29120207.

It is a cyclic number.

It is not a de Polignac number, because 12187878827 - 2³² = 7892911531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12187878877) 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, 4063838 + ... + 4066835.

It is an arithmetic number, because the mean of its divisors is an integer number (3049002750).

Almost surely, 2^12187878827 is an apocalyptic number.

12187878827 is a deficient number, since it is larger than the sum of its proper divisors (8132173).

12187878827 is an equidigital number, since it uses as much as digits as its factorization.

12187878827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8132172.

The product of its digits is 5619712, while the sum is 59.

The spelling of 12187878827 in words is "twelve billion, one hundred eighty-seven million, eight hundred seventy-eight thousand, eight hundred twenty-seven".