81713708517 has 32 divisors (see below), whose sum is σ = 125372620800. Its totient is φ = 46372667328.

The previous prime is 81713708509. The next prime is 81713708561. The reversal of 81713708517 is 71580731718.

It is not a de Polignac number, because 81713708517 - 2³ = 81713708509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81713718517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8102284 + ... + 8112362.

It is an arithmetic number, because the mean of its divisors is an integer number (3917894400).

Almost surely, 2^81713708517 is an apocalyptic number.

It is an amenable number.

81713708517 is a deficient number, since it is larger than the sum of its proper divisors (43658912283).

81713708517 is a wasteful number, since it uses less digits than its factorization.

81713708517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12705.

The product of its (nonzero) digits is 329280, while the sum is 48.

The spelling of 81713708517 in words is "eighty-one billion, seven hundred thirteen million, seven hundred eight thousand, five hundred seventeen".