12663751681 has 16 divisors (see below), whose sum is σ = 14772602880. Its totient is φ = 10631198160.

The previous prime is 12663751663. The next prime is 12663751691. The reversal of 12663751681 is 18615736621.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12663751681 - 2⁵ = 12663751649 is a prime.

It is a super-2 number, since 2×12663751681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12663751601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55350 + ... + 168496.

It is an arithmetic number, because the mean of its divisors is an integer number (923287680).

Almost surely, 2^12663751681 is an apocalyptic number.

It is an amenable number.

12663751681 is a deficient number, since it is larger than the sum of its proper divisors (2108851199).

12663751681 is a wasteful number, since it uses less digits than its factorization.

12663751681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113484.

The product of its digits is 362880, while the sum is 46.

The spelling of 12663751681 in words is "twelve billion, six hundred sixty-three million, seven hundred fifty-one thousand, six hundred eighty-one".