81707317113293 has 2 divisors, whose sum is σ = 81707317113294. Its totient is φ = 81707317113292.

The previous prime is 81707317113277. The next prime is 81707317113337. The reversal of 81707317113293 is 39231171370718.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69291856133929 + 12415460979364 = 8324173^2 + 3523558^2 .

It is a cyclic number.

It is not a de Polignac number, because 81707317113293 - 2⁴ = 81707317113277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81707317113203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40853658556646 + 40853658556647.

It is an arithmetic number, because the mean of its divisors is an integer number (40853658556647).

Almost surely, 2^{81707317113293} is an apocalyptic number.

It is an amenable number.

81707317113293 is a deficient number, since it is larger than the sum of its proper divisors (1).

81707317113293 is an equidigital number, since it uses as much as digits as its factorization.

81707317113293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The spelling of 81707317113293 in words is "eighty-one trillion, seven hundred seven billion, three hundred seventeen million, one hundred thirteen thousand, two hundred ninety-three".