6544761673649 has 2 divisors, whose sum is σ = 6544761673650. Its totient is φ = 6544761673648.

The previous prime is 6544761673613. The next prime is 6544761673687. The reversal of 6544761673649 is 9463761674456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4029682863649 + 2515078810000 = 2007407^2 + 1585900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6544761673649 is a prime.

It is not a weakly prime, because it can be changed into another prime (6544761603649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272380836824 + 3272380836825.

It is an arithmetic number, because the mean of its divisors is an integer number (3272380836825).

Almost surely, 2^{6544761673649} is an apocalyptic number.

It is an amenable number.

6544761673649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6544761673649 is an equidigital number, since it uses as much as digits as its factorization.

6544761673649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 548674560, while the sum is 68.

The spelling of 6544761673649 in words is "six trillion, five hundred forty-four billion, seven hundred sixty-one million, six hundred seventy-three thousand, six hundred forty-nine".