12561874227 has 20 divisors (see below), whose sum is σ = 21446022576. Its totient is φ = 7178213520.

The previous prime is 12561874217. The next prime is 12561874229. The reversal of 12561874227 is 72247816521.

12561874227 is a `hidden beast` number, since 1 + 2 + 5 + 618 + 7 + 4 + 2 + 27 = 666.

It is not a de Polignac number, because 12561874227 - 2⁴ = 12561874211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12561874229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11076924 + ... + 11078057.

Almost surely, 2^12561874227 is an apocalyptic number.

12561874227 is a deficient number, since it is larger than the sum of its proper divisors (8884148349).

12561874227 is an equidigital number, since it uses as much as digits as its factorization.

12561874227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22155000 (or 22154991 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The spelling of 12561874227 in words is "twelve billion, five hundred sixty-one million, eight hundred seventy-four thousand, two hundred twenty-seven".