818506664168 has 16 divisors (see below), whose sum is σ = 1534765398180. Its totient is φ = 409235891328.

The previous prime is 818506664009. The next prime is 818506664177. The reversal of 818506664168 is 861466605818.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 528328367044 + 290178297124 = 726862^2 + 538682^2 .

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1979555 + ... + 2357042.

Almost surely, 2^818506664168 is an apocalyptic number.

It is an amenable number.

818506664168 is a deficient number, since it is larger than the sum of its proper divisors (716258734012).

818506664168 is a wasteful number, since it uses less digits than its factorization.

818506664168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360196 (or 4360192 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 59.

The spelling of 818506664168 in words is "eight hundred eighteen billion, five hundred six million, six hundred sixty-four thousand, one hundred sixty-eight".