81707317113193 has 2 divisors, whose sum is σ = 81707317113194. Its totient is φ = 81707317113192.

The previous prime is 81707317113179. The next prime is 81707317113203. The reversal of 81707317113193 is 39131171370718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60167201589504 + 21540115523689 = 7756752^2 + 4641133^2 .

It is a cyclic number.

It is not a de Polignac number, because 81707317113193 - 2²⁹ = 81706780242281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81707317113193.

It is not a weakly prime, because it can be changed into another prime (81707317113293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40853658556596 + 40853658556597.

It is an arithmetic number, because the mean of its divisors is an integer number (40853658556597).

Almost surely, 2^{81707317113193} is an apocalyptic number.

It is an amenable number.

81707317113193 is a deficient number, since it is larger than the sum of its proper divisors (1).

81707317113193 is an equidigital number, since it uses as much as digits as its factorization.

81707317113193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 666792, while the sum is 52.

The spelling of 81707317113193 in words is "eighty-one trillion, seven hundred seven billion, three hundred seventeen million, one hundred thirteen thousand, one hundred ninety-three".