12938728666651 has 2 divisors, whose sum is σ = 12938728666652. Its totient is φ = 12938728666650.

The previous prime is 12938728666649. The next prime is 12938728666769. The reversal of 12938728666651 is 15666682783921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12938728666651 - 2¹ = 12938728666649 is a prime.

Together with 12938728666649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12938728660651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6469364333325 + 6469364333326.

It is an arithmetic number, because the mean of its divisors is an integer number (6469364333326).

Almost surely, 2^{12938728666651} is an apocalyptic number.

12938728666651 is a deficient number, since it is larger than the sum of its proper divisors (1).

12938728666651 is an equidigital number, since it uses as much as digits as its factorization.

12938728666651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 313528320, while the sum is 70.

The spelling of 12938728666651 in words is "twelve trillion, nine hundred thirty-eight billion, seven hundred twenty-eight million, six hundred sixty-six thousand, six hundred fifty-one".