12647026681 has 3 divisors (see below), whose sum is σ = 12647139141. Its totient is φ = 12646914222.

The previous prime is 12647026669. The next prime is 12647026687. The reversal of 12647026681 is 18662074621.

The square root of 12647026681 is 112459.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12647026681 - 2¹¹ = 12647024633 is a prime.

It is a super-2 number, since 2×12647026681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12647026687) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 56230 + ... + 168688.

It is an arithmetic number, because the mean of its divisors is an integer number (4215713047).

Almost surely, 2^12647026681 is an apocalyptic number.

12647026681 is the 112459-th square number.

12647026681 is the 56230-th centered octagonal number.

It is an amenable number.

12647026681 is a deficient number, since it is larger than the sum of its proper divisors (112460).

12647026681 is an frugal number, since it uses more digits than its factorization.

12647026681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224918 (or 112459 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 12647026681 in words is "twelve billion, six hundred forty-seven million, twenty-six thousand, six hundred eighty-one".