161325216 has 192 divisors, whose sum is σ = 518192640. Its totient is φ = 48522240.

The previous prime is 161325187. The next prime is 161325221. The reversal of 161325216 is 612523161.

161325216 is a `hidden beast` number, since 1 + 6 + 132 + 521 + 6 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 161325216.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 595161 + ... + 595431.

It is an arithmetic number, because the mean of its divisors is an integer number (2698920).

Almost surely, 2^161325216 is an apocalyptic number.

161325216 is a gapful number since it is divisible by the number (16) 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 161325216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259096320).

161325216 is an abundant number, since it is smaller than the sum of its proper divisors (356867424).

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

161325216 is a wasteful number, since it uses less digits than its factorization.

161325216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 342 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 161325216 is about 12701.3863810216. The cubic root of 161325216 is about 544.3782332119.

Adding to 161325216 its reverse (612523161), we get a palindrome (773848377).

The spelling of 161325216 in words is "one hundred sixty-one million, three hundred twenty-five thousand, two hundred sixteen".