12646581518651 has 2 divisors, whose sum is σ = 12646581518652. Its totient is φ = 12646581518650.

The previous prime is 12646581518531. The next prime is 12646581518687. The reversal of 12646581518651 is 15681518564621.

12646581518651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12646581518651 is a prime.

It is not a weakly prime, because it can be changed into another prime (12646581512651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6323290759325 + 6323290759326.

It is an arithmetic number, because the mean of its divisors is an integer number (6323290759326).

Almost surely, 2^{12646581518651} is an apocalyptic number.

12646581518651 is a deficient number, since it is larger than the sum of its proper divisors (1).

12646581518651 is an equidigital number, since it uses as much as digits as its factorization.

12646581518651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824000, while the sum is 59.

The spelling of 12646581518651 in words is "twelve trillion, six hundred forty-six billion, five hundred eighty-one million, five hundred eighteen thousand, six hundred fifty-one".