161320208 has 80 divisors (see below), whose sum is σ = 381047040. Its totient is φ = 64585728.

The previous prime is 161320193. The next prime is 161320217. The reversal of 161320208 is 802023161.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367253 + ... + 367691.

It is an arithmetic number, because the mean of its divisors is an integer number (4763088).

Almost surely, 2^161320208 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 161320208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190523520).

161320208 is an abundant number, since it is smaller than the sum of its proper divisors (219726832).

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

161320208 is a wasteful number, since it uses less digits than its factorization.

161320208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 161320208 is about 12701.1892356582. The cubic root of 161320208 is about 544.3726001301.

Adding to 161320208 its reverse (802023161), we get a palindrome (963343369).

The spelling of 161320208 in words is "one hundred sixty-one million, three hundred twenty thousand, two hundred eight".