81065361717 has 6 divisors (see below), whose sum is σ = 117094411382. Its totient is φ = 54043574472.

The previous prime is 81065361709. The next prime is 81065361749. The reversal of 81065361717 is 71716356018.

81065361717 is a `hidden beast` number, since 8 + 10 + 6 + 5 + 3 + 617 + 17 = 666.

It can be written as a sum of positive squares in only one way, i.e., 62679628881 + 18385732836 = 250359^2 + 135594^2 .

It is not a de Polignac number, because 81065361717 - 2³ = 81065361709 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 (81065361617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4503631198 + ... + 4503631215.

Almost surely, 2^81065361717 is an apocalyptic number.

It is an amenable number.

81065361717 is a deficient number, since it is larger than the sum of its proper divisors (36029049665).

81065361717 is a wasteful number, since it uses less digits than its factorization.

81065361717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9007262419 (or 9007262416 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 81065361717 in words is "eighty-one billion, sixty-five million, three hundred sixty-one thousand, seven hundred seventeen".