161511168 has 144 divisors (see below), whose sum is σ = 529281536. Its totient is φ = 42577920.

The previous prime is 161511149. The next prime is 161511197. The reversal of 161511168 is 861115161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68733 + ... + 71043.

Almost surely, 2^161511168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161511168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264640768).

161511168 is an abundant number, since it is smaller than the sum of its proper divisors (367770368).

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

161511168 is a wasteful number, since it uses less digits than its factorization.

161511168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350 (or 2336 counting only the distinct ones).

The product of its digits is 1440, while the sum is 30.

The square root of 161511168 is about 12708.7044186258. The cubic root of 161511168 is about 544.5873126415.

The spelling of 161511168 in words is "one hundred sixty-one million, five hundred eleven thousand, one hundred sixty-eight".