161118508689 has 6 divisors (see below), whose sum is σ = 232726734786. Its totient is φ = 107412339120.

The previous prime is 161118508637. The next prime is 161118508697. The reversal of 161118508689 is 986805811161.

161118508689 is a `hidden beast` number, since 1 + 61 + 1 + 18 + 508 + 68 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 161095468689 + 23040000 = 401367^2 + 4800^2 .

It is not a de Polignac number, because 161118508689 - 2¹³ = 161118500497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161118508289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8951028252 + ... + 8951028269.

It is an arithmetic number, because the mean of its divisors is an integer number (38787789131).

Almost surely, 2^161118508689 is an apocalyptic number.

It is an amenable number.

161118508689 is a deficient number, since it is larger than the sum of its proper divisors (71608226097).

161118508689 is a wasteful number, since it uses less digits than its factorization.

161118508689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17902056527 (or 17902056524 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 54.

The spelling of 161118508689 in words is "one hundred sixty-one billion, one hundred eighteen million, five hundred eight thousand, six hundred eighty-nine".