18520105717 has 2 divisors, whose sum is σ = 18520105718. Its totient is φ = 18520105716.

The previous prime is 18520105693. The next prime is 18520105727. The reversal of 18520105717 is 71750102581.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15385673521 + 3134432196 = 124039^2 + 55986^2 .

It is an emirp because it is prime and its reverse (71750102581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18520105717 - 2⁷ = 18520105589 is a prime.

It is a super-4 number, since 4×18520105717⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18520105727) 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, 9260052858 + 9260052859.

It is an arithmetic number, because the mean of its divisors is an integer number (9260052859).

Almost surely, 2^18520105717 is an apocalyptic number.

It is an amenable number.

18520105717 is a deficient number, since it is larger than the sum of its proper divisors (1).

18520105717 is an equidigital number, since it uses as much as digits as its factorization.

18520105717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19600, while the sum is 37.

The spelling of 18520105717 in words is "eighteen billion, five hundred twenty million, one hundred five thousand, seven hundred seventeen".