9618684868181 has 2 divisors, whose sum is σ = 9618684868182. Its totient is φ = 9618684868180.

The previous prime is 9618684868159. The next prime is 9618684868207. The reversal of 9618684868181 is 1818684868169.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6249955000081 + 3368729868100 = 2499991^2 + 1835410^2 .

It is a cyclic number.

It is not a de Polignac number, because 9618684868181 - 2¹⁰ = 9618684867157 is a prime.

It is a super-2 number, since 2×9618684868181² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9618684868099 and 9618684868108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9618684868141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4809342434090 + 4809342434091.

It is an arithmetic number, because the mean of its divisors is an integer number (4809342434091).

Almost surely, 2^{9618684868181} is an apocalyptic number.

It is an amenable number.

9618684868181 is a deficient number, since it is larger than the sum of its proper divisors (1).

9618684868181 is an equidigital number, since it uses as much as digits as its factorization.

9618684868181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254803968, while the sum is 74.

The spelling of 9618684868181 in words is "nine trillion, six hundred eighteen billion, six hundred eighty-four million, eight hundred sixty-eight thousand, one hundred eighty-one".