161217446166 has 96 divisors (see below), whose sum is σ = 401125091328. Its totient is φ = 45840936960.

The previous prime is 161217446141. The next prime is 161217446177. The reversal of 161217446166 is 661644712161.

161217446166 is a `hidden beast` number, since 1 + 6 + 1 + 21 + 7 + 4 + 4 + 616 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59031021 + ... + 59033751.

It is an arithmetic number, because the mean of its divisors is an integer number (4178386368).

Almost surely, 2^161217446166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161217446166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200562545664).

161217446166 is an abundant number, since it is smaller than the sum of its proper divisors (239907645162).

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

161217446166 is a wasteful number, since it uses less digits than its factorization.

161217446166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4826 (or 4823 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 161217446166 in words is "one hundred sixty-one billion, two hundred seventeen million, four hundred forty-six thousand, one hundred sixty-six".