81107730017 has 2 divisors, whose sum is σ = 81107730018. Its totient is φ = 81107730016.

The previous prime is 81107729981. The next prime is 81107730019. The reversal of 81107730017 is 71003770118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58523351056 + 22584378961 = 241916^2 + 150281^2 .

It is a cyclic number.

It is not a de Polignac number, because 81107730017 - 2¹⁰ = 81107728993 is a prime.

Together with 81107730019, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81107730019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40553865008 + 40553865009.

It is an arithmetic number, because the mean of its divisors is an integer number (40553865009).

Almost surely, 2^81107730017 is an apocalyptic number.

It is an amenable number.

81107730017 is a deficient number, since it is larger than the sum of its proper divisors (1).

81107730017 is an equidigital number, since it uses as much as digits as its factorization.

81107730017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8232, while the sum is 35.

The spelling of 81107730017 in words is "eighty-one billion, one hundred seven million, seven hundred thirty thousand, seventeen".