168561099636 has 24 divisors (see below), whose sum is σ = 399179521440. Its totient is φ = 55348420512.

The previous prime is 168561099601. The next prime is 168561099647. The reversal of 168561099636 is 636990165861.

168561099636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 168561099636.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 104825751 + ... + 104827358.

It is an arithmetic number, because the mean of its divisors is an integer number (16632480060).

Almost surely, 2^168561099636 is an apocalyptic number.

It is an amenable number.

168561099636 is an abundant number, since it is smaller than the sum of its proper divisors (230618421804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168561099636 is a wasteful number, since it uses less digits than its factorization.

168561099636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209653183 (or 209653181 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 60.

The spelling of 168561099636 in words is "one hundred sixty-eight billion, five hundred sixty-one million, ninety-nine thousand, six hundred thirty-six".