12647798181 has 12 divisors (see below), whose sum is σ = 18272555808. Its totient is φ = 8430243624.

The previous prime is 12647798179. The next prime is 12647798197. The reversal of 12647798181 is 18189774621.

12647798181 is a `hidden beast` number, since 1 + 2 + 6 + 477 + 98 + 1 + 81 = 666.

It is not a de Polignac number, because 12647798181 - 2¹ = 12647798179 is a prime.

It is a super-2 number, since 2×12647798181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12647798161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84775 + ... + 180228.

It is an arithmetic number, because the mean of its divisors is an integer number (1522712984).

Almost surely, 2^12647798181 is an apocalyptic number.

It is an amenable number.

12647798181 is a deficient number, since it is larger than the sum of its proper divisors (5624757627).

12647798181 is a wasteful number, since it uses less digits than its factorization.

12647798181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270312 (or 270309 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The spelling of 12647798181 in words is "twelve billion, six hundred forty-seven million, seven hundred ninety-eight thousand, one hundred eighty-one".