161503216 has 60 divisors (see below), whose sum is σ = 367422912. Its totient is φ = 68565504.

The previous prime is 161503201. The next prime is 161503241. The reversal of 161503216 is 612305161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87681 + ... + 89503.

Almost surely, 2^161503216 is an apocalyptic number.

161503216 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 161503216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183711456).

161503216 is an abundant number, since it is smaller than the sum of its proper divisors (205919696).

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

161503216 is a wasteful number, since it uses less digits than its factorization.

161503216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958 (or 1945 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 161503216 is about 12708.3915583366. The cubic root of 161503216 is about 544.5783749120.

Adding to 161503216 its reverse (612305161), we get a palindrome (773808377).

The spelling of 161503216 in words is "one hundred sixty-one million, five hundred three thousand, two hundred sixteen".