6517716516491 has 2 divisors, whose sum is σ = 6517716516492. Its totient is φ = 6517716516490.

The previous prime is 6517716516473. The next prime is 6517716516503. The reversal of 6517716516491 is 1946156177156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6517716516491 - 2¹⁴ = 6517716500107 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6517716516491.

It is not a weakly prime, because it can be changed into another prime (6517713516491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258858258245 + 3258858258246.

It is an arithmetic number, because the mean of its divisors is an integer number (3258858258246).

Almost surely, 2^{6517716516491} is an apocalyptic number.

6517716516491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6517716516491 is an equidigital number, since it uses as much as digits as its factorization.

6517716516491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9525600, while the sum is 59.

The spelling of 6517716516491 in words is "six trillion, five hundred seventeen billion, seven hundred sixteen million, five hundred sixteen thousand, four hundred ninety-one".