18291168517 has 2 divisors, whose sum is σ = 18291168518. Its totient is φ = 18291168516.

The previous prime is 18291168503. The next prime is 18291168527. The reversal of 18291168517 is 71586119281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17721200641 + 569967876 = 133121^2 + 23874^2 .

It is a cyclic number.

It is not a de Polignac number, because 18291168517 - 2¹⁵ = 18291135749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18291168527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9145584258 + 9145584259.

It is an arithmetic number, because the mean of its divisors is an integer number (9145584259).

Almost surely, 2^18291168517 is an apocalyptic number.

It is an amenable number.

18291168517 is a deficient number, since it is larger than the sum of its proper divisors (1).

18291168517 is an equidigital number, since it uses as much as digits as its factorization.

18291168517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 49.

The spelling of 18291168517 in words is "eighteen billion, two hundred ninety-one million, one hundred sixty-eight thousand, five hundred seventeen".