12656412171 has 24 divisors (see below), whose sum is σ = 19936978880. Its totient is φ = 7689966336.

The previous prime is 12656412169. The next prime is 12656412179. The reversal of 12656412171 is 17121465621.

12656412171 is a `hidden beast` number, since 1 + 2 + 6 + 5 + 641 + 2 + 1 + 7 + 1 = 666.

It is not a de Polignac number, because 12656412171 - 2¹ = 12656412169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12656412179) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 675406 + ... + 693891.

Almost surely, 2^12656412171 is an apocalyptic number.

12656412171 is a deficient number, since it is larger than the sum of its proper divisors (7280566709).

12656412171 is a wasteful number, since it uses less digits than its factorization.

12656412171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369395 (or 1369392 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

Adding to 12656412171 its reverse (17121465621), we get a palindrome (29777877792).

The spelling of 12656412171 in words is "twelve billion, six hundred fifty-six million, four hundred twelve thousand, one hundred seventy-one".