12646341649 has 2 divisors, whose sum is σ = 12646341650. Its totient is φ = 12646341648.

The previous prime is 12646341641. The next prime is 12646341709. The reversal of 12646341649 is 94614364621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9816846400 + 2829495249 = 99080^2 + 53193^2 .

It is a cyclic number.

It is not a de Polignac number, because 12646341649 - 2³ = 12646341641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12646341599 and 12646341608.

It is not a weakly prime, because it can be changed into another prime (12646341641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6323170824 + 6323170825.

It is an arithmetic number, because the mean of its divisors is an integer number (6323170825).

Almost surely, 2^12646341649 is an apocalyptic number.

It is an amenable number.

12646341649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12646341649 is an equidigital number, since it uses as much as digits as its factorization.

12646341649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 46.

The spelling of 12646341649 in words is "twelve billion, six hundred forty-six million, three hundred forty-one thousand, six hundred forty-nine".