12640547459 has 2 divisors, whose sum is σ = 12640547460. Its totient is φ = 12640547458.

The previous prime is 12640547441. The next prime is 12640547533. The reversal of 12640547459 is 95474504621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12640547459 is a prime.

It is not a weakly prime, because it can be changed into another prime (12640547419) 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, 6320273729 + 6320273730.

It is an arithmetic number, because the mean of its divisors is an integer number (6320273730).

Almost surely, 2^12640547459 is an apocalyptic number.

12640547459 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640547459 is an equidigital number, since it uses as much as digits as its factorization.

12640547459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 12640547459 in words is "twelve billion, six hundred forty million, five hundred forty-seven thousand, four hundred fifty-nine".