12816064643 has 2 divisors, whose sum is σ = 12816064644. Its totient is φ = 12816064642.

The previous prime is 12816064633. The next prime is 12816064687. The reversal of 12816064643 is 34646061821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12816064643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12816064643.

It is not a weakly prime, because it can be changed into another prime (12816064603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6408032321 + 6408032322.

It is an arithmetic number, because the mean of its divisors is an integer number (6408032322).

Almost surely, 2^12816064643 is an apocalyptic number.

12816064643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12816064643 is an equidigital number, since it uses as much as digits as its factorization.

12816064643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 12816064643 in words is "twelve billion, eight hundred sixteen million, sixty-four thousand, six hundred forty-three".