81330164717 has 4 divisors (see below), whose sum is σ = 81358634556. Its totient is φ = 81301694880.

The previous prime is 81330164711. The next prime is 81330164743. The reversal of 81330164717 is 71746103318.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71810064676 + 9520100041 = 267974^2 + 97571^2 .

It is a cyclic number.

It is not a de Polignac number, because 81330164717 - 2¹⁰ = 81330163693 is a prime.

It is a super-2 number, since 2×81330164717² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81330164711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14230634 + ... + 14236347.

It is an arithmetic number, because the mean of its divisors is an integer number (20339658639).

Almost surely, 2^81330164717 is an apocalyptic number.

It is an amenable number.

81330164717 is a deficient number, since it is larger than the sum of its proper divisors (28469839).

81330164717 is a wasteful number, since it uses less digits than its factorization.

81330164717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28469838.

The product of its (nonzero) digits is 84672, while the sum is 41.

The spelling of 81330164717 in words is "eighty-one billion, three hundred thirty million, one hundred sixty-four thousand, seven hundred seventeen".