161806316 has 24 divisors (see below), whose sum is σ = 325982496. Its totient is φ = 68837760.

The previous prime is 161806313. The next prime is 161806319. The reversal of 161806316 is 613608161.

It is an interprime number because it is at equal distance from previous prime (161806313) and next prime (161806319).

It is not an unprimeable number, because it can be changed into a prime (161806313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17255 + ... + 24926.

It is an arithmetic number, because the mean of its divisors is an integer number (13582604).

Almost surely, 2^161806316 is an apocalyptic number.

It is an amenable number.

161806316 is an abundant number, since it is smaller than the sum of its proper divisors (164176180).

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

161806316 is a wasteful number, since it uses less digits than its factorization.

161806316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42329 (or 42327 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 161806316 is about 12720.3111597162. The cubic root of 161806316 is about 544.9188398629.

The spelling of 161806316 in words is "one hundred sixty-one million, eight hundred six thousand, three hundred sixteen".