161912160 has 144 divisors (see below), whose sum is σ = 556068240. Its totient is φ = 42900480.

The previous prime is 161912143. The next prime is 161912161. The reversal of 161912160 is 61219161.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161912161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 329515 + ... + 330005.

It is an arithmetic number, because the mean of its divisors is an integer number (3861585).

Almost surely, 2^161912160 is an apocalyptic number.

161912160 is a gapful number since it is divisible by the number (10) 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 161912160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278034120).

161912160 is an abundant number, since it is smaller than the sum of its proper divisors (394156080).

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

161912160 is a wasteful number, since it uses less digits than its factorization.

161912160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741 (or 730 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 161912160 is about 12724.4709123798. The cubic root of 161912160 is about 545.0376317196.

The spelling of 161912160 in words is "one hundred sixty-one million, nine hundred twelve thousand, one hundred sixty".