12646408571 has 2 divisors, whose sum is σ = 12646408572. Its totient is φ = 12646408570.

The previous prime is 12646408543. The next prime is 12646408583. The reversal of 12646408571 is 17580464621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12646408571 - 2⁶ = 12646408507 is a prime.

It is not a weakly prime, because it can be changed into another prime (12646408501) 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 as a sum of consecutive naturals, namely, 6323204285 + 6323204286.

It is an arithmetic number, because the mean of its divisors is an integer number (6323204286).

Almost surely, 2^12646408571 is an apocalyptic number.

12646408571 is a deficient number, since it is larger than the sum of its proper divisors (1).

12646408571 is an equidigital number, since it uses as much as digits as its factorization.

12646408571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 12646408571 in words is "twelve billion, six hundred forty-six million, four hundred eight thousand, five hundred seventy-one".