161366272 has 72 divisors (see below), whose sum is σ = 335101536. Its totient is φ = 77500416.

The previous prime is 161366267. The next prime is 161366279. The reversal of 161366272 is 272663161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161366279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177788 + ... + 1177924.

It is an arithmetic number, because the mean of its divisors is an integer number (4654188).

Almost surely, 2^161366272 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 161366272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167550768).

161366272 is an abundant number, since it is smaller than the sum of its proper divisors (173735264).

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

161366272 is a wasteful number, since it uses less digits than its factorization.

161366272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 289 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 161366272 is about 12703.0024797290. The cubic root of 161366272 is about 544.4244092894.

The spelling of 161366272 in words is "one hundred sixty-one million, three hundred sixty-six thousand, two hundred seventy-two".