6544403620673 has 2 divisors, whose sum is σ = 6544403620674. Its totient is φ = 6544403620672.

The previous prime is 6544403620649. The next prime is 6544403620709. The reversal of 6544403620673 is 3760263044456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4695815322289 + 1848588298384 = 2166983^2 + 1359628^2 .

It is a cyclic number.

It is not a de Polignac number, because 6544403620673 - 2²⁴ = 6544386843457 is a prime.

It is a super-3 number, since 3×6544403620673³ (a number of 39 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (6544403320673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272201810336 + 3272201810337.

It is an arithmetic number, because the mean of its divisors is an integer number (3272201810337).

Almost surely, 2^{6544403620673} is an apocalyptic number.

It is an amenable number.

6544403620673 is a deficient number, since it is larger than the sum of its proper divisors (1).

6544403620673 is an equidigital number, since it uses as much as digits as its factorization.

6544403620673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 50.

The spelling of 6544403620673 in words is "six trillion, five hundred forty-four billion, four hundred three million, six hundred twenty thousand, six hundred seventy-three".