161508168 has 80 divisors (see below), whose sum is σ = 462084480. Its totient is φ = 52680672.

The previous prime is 161508161. The next prime is 161508181. The reversal of 161508168 is 861805161.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (161508161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27805 + ... + 33107.

It is an arithmetic number, because the mean of its divisors is an integer number (5776056).

Almost surely, 2^161508168 is an apocalyptic number.

161508168 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161508168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231042240).

161508168 is an abundant number, since it is smaller than the sum of its proper divisors (300576312).

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

161508168 is a wasteful number, since it uses less digits than its factorization.

161508168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5368 (or 5355 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 161508168 is about 12708.5863887373. The cubic root of 161508168 is about 544.5839407961.

The spelling of 161508168 in words is "one hundred sixty-one million, five hundred eight thousand, one hundred sixty-eight".