161646441166 has 64 divisors (see below), whose sum is σ = 290706071040. Its totient is φ = 65961584640.

The previous prime is 161646441139. The next prime is 161646441223. The reversal of 161646441166 is 661144646161.

161646441166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

161646441166 is a nontrivial binomial coefficient, being equal to C(568589, 2).

It is a super-2 number, since 2×161646441166² (a number of 23 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 46622565 + ... + 46626031.

It is an arithmetic number, because the mean of its divisors is an integer number (4542282360).

Almost surely, 2^161646441166 is an apocalyptic number.

161646441166 is the 568588-th triangular number.

161646441166 is the 189530-th centered nonagonal number.

161646441166 is a deficient number, since it is larger than the sum of its proper divisors (129059629874).

161646441166 is a wasteful number, since it uses less digits than its factorization.

161646441166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5449.

The product of its digits is 497664, while the sum is 46.

The spelling of 161646441166 in words is "one hundred sixty-one billion, six hundred forty-six million, four hundred forty-one thousand, one hundred sixty-six".