6544431372613 has 2 divisors, whose sum is σ = 6544431372614. Its totient is φ = 6544431372612.

The previous prime is 6544431372587. The next prime is 6544431372617. The reversal of 6544431372613 is 3162731344456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3544943371204 + 2999488001409 = 1882802^2 + 1731903^2 .

It is a cyclic number.

It is not a de Polignac number, because 6544431372613 - 2²⁵ = 6544397818181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6544431372617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272215686306 + 3272215686307.

It is an arithmetic number, because the mean of its divisors is an integer number (3272215686307).

Almost surely, 2^{6544431372613} is an apocalyptic number.

It is an amenable number.

6544431372613 is a deficient number, since it is larger than the sum of its proper divisors (1).

6544431372613 is an equidigital number, since it uses as much as digits as its factorization.

6544431372613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 49.

The spelling of 6544431372613 in words is "six trillion, five hundred forty-four billion, four hundred thirty-one million, three hundred seventy-two thousand, six hundred thirteen".