71206345981717 has 2 divisors, whose sum is σ = 71206345981718. Its totient is φ = 71206345981716.

The previous prime is 71206345981681. The next prime is 71206345981787. The reversal of 71206345981717 is 71718954360217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71194680037636 + 11665944081 = 8437694^2 + 108009^2 .

It is a cyclic number.

It is not a de Polignac number, because 71206345981717 - 2¹¹ = 71206345979669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71206345981787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35603172990858 + 35603172990859.

It is an arithmetic number, because the mean of its divisors is an integer number (35603172990859).

It is a 1-persistent number, because it is pandigital, but 2⋅71206345981717 = 142412691963434 is not.

Almost surely, 2^{71206345981717} is an apocalyptic number.

It is an amenable number.

71206345981717 is a deficient number, since it is larger than the sum of its proper divisors (1).

71206345981717 is an equidigital number, since it uses as much as digits as its factorization.

71206345981717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17781120, while the sum is 61.

The spelling of 71206345981717 in words is "seventy-one trillion, two hundred six billion, three hundred forty-five million, nine hundred eighty-one thousand, seven hundred seventeen".