6918856717 has 2 divisors, whose sum is σ = 6918856718. Its totient is φ = 6918856716.

The previous prime is 6918856697. The next prime is 6918856727. The reversal of 6918856717 is 7176588196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5919917481 + 998939236 = 76941^2 + 31606^2 .

It is a cyclic number.

It is not a de Polignac number, because 6918856717 - 2¹¹ = 6918854669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6918856727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3459428358 + 3459428359.

It is an arithmetic number, because the mean of its divisors is an integer number (3459428359).

Almost surely, 2^6918856717 is an apocalyptic number.

It is an amenable number.

6918856717 is a deficient number, since it is larger than the sum of its proper divisors (1).

6918856717 is an equidigital number, since it uses as much as digits as its factorization.

6918856717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 58.

The square root of 6918856717 is about 83179.6652854530. The cubic root of 6918856717 is about 1905.5109361268.

The spelling of 6918856717 in words is "six billion, nine hundred eighteen million, eight hundred fifty-six thousand, seven hundred seventeen".