81707317110487 has 8 divisors (see below), whose sum is σ = 83925136477952. Its totient is φ = 79489998453600.

The previous prime is 81707317110443. The next prime is 81707317110491. The reversal of 81707317110487 is 78401171370718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81707317110487 - 2³⁵ = 81672957372119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81702317110487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124846839 + ... + 125499592.

It is an arithmetic number, because the mean of its divisors is an integer number (10490642059744).

Almost surely, 2^{81707317110487} is an apocalyptic number.

81707317110487 is a deficient number, since it is larger than the sum of its proper divisors (2217819367465).

81707317110487 is a wasteful number, since it uses less digits than its factorization.

81707317110487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250355289.

The product of its (nonzero) digits is 1843968, while the sum is 55.

The spelling of 81707317110487 in words is "eighty-one trillion, seven hundred seven billion, three hundred seventeen million, one hundred ten thousand, four hundred eighty-seven".