81707517361 has 8 divisors (see below), whose sum is σ = 81822709440. Its totient is φ = 81592392432.

The previous prime is 81707517349. The next prime is 81707517383. The reversal of 81707517361 is 16371570718.

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 81707517361 - 2³⁵ = 47347778993 is a prime.

It is a super-2 number, since 2×81707517361² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81707517961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2726686 + ... + 2756488.

It is an arithmetic number, because the mean of its divisors is an integer number (10227838680).

Almost surely, 2^81707517361 is an apocalyptic number.

It is an amenable number.

81707517361 is a deficient number, since it is larger than the sum of its proper divisors (115192079).

81707517361 is a wasteful number, since it uses less digits than its factorization.

81707517361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33575.

The product of its (nonzero) digits is 246960, while the sum is 46.

The spelling of 81707517361 in words is "eighty-one billion, seven hundred seven million, five hundred seventeen thousand, three hundred sixty-one".