161812224 has 216 divisors, whose sum is σ = 544194560. Its totient is φ = 45287424.

The previous prime is 161812223. The next prime is 161812237. The reversal of 161812224 is 422218161.

161812224 is a `hidden beast` number, since 1 + 618 + 1 + 22 + 24 = 666.

161812224 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161812223) 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, 1274049 + ... + 1274175.

Almost surely, 2^161812224 is an apocalyptic number.

161812224 is a gapful number since it is divisible by the number (14) 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 161812224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272097280).

161812224 is an abundant number, since it is smaller than the sum of its proper divisors (382382336).

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

161812224 is a wasteful number, since it uses less digits than its factorization.

161812224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 218 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 161812224 is about 12720.5433846200. The cubic root of 161812224 is about 544.9254719512.

The spelling of 161812224 in words is "one hundred sixty-one million, eight hundred twelve thousand, two hundred twenty-four".