18021147013717 has 2 divisors, whose sum is σ = 18021147013718. Its totient is φ = 18021147013716.

The previous prime is 18021147013699. The next prime is 18021147013741. The reversal of 18021147013717 is 71731074112081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17552865468996 + 468281544721 = 4189614^2 + 684311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18021147013717 is a prime.

It is a super-2 number, since 2×18021147013717² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18021147013417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010573506858 + 9010573506859.

It is an arithmetic number, because the mean of its divisors is an integer number (9010573506859).

Almost surely, 2^{18021147013717} is an apocalyptic number.

It is an amenable number.

18021147013717 is a deficient number, since it is larger than the sum of its proper divisors (1).

18021147013717 is an equidigital number, since it uses as much as digits as its factorization.

18021147013717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65856, while the sum is 43.

The spelling of 18021147013717 in words is "eighteen trillion, twenty-one billion, one hundred forty-seven million, thirteen thousand, seven hundred seventeen".