161540316 has 144 divisors (see below), whose sum is σ = 498161664. Its totient is φ = 43135488.

The previous prime is 161540297. The next prime is 161540329. The reversal of 161540316 is 613045161.

161540316 is a `hidden beast` number, since 1 + 615 + 40 + 3 + 1 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 161540316.

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 47 ways as a sum of consecutive naturals, for example, 272116 + ... + 272708.

It is an arithmetic number, because the mean of its divisors is an integer number (3459456).

Almost surely, 2^161540316 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 161540316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249080832).

161540316 is an abundant number, since it is smaller than the sum of its proper divisors (336621348).

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

161540316 is a wasteful number, since it uses less digits than its factorization.

161540316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 675 counting only the distinct ones).

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

The square root of 161540316 is about 12709.8511399623. The cubic root of 161540316 is about 544.6200713177.

Adding to 161540316 its reverse (613045161), we get a palindrome (774585477).

The spelling of 161540316 in words is "one hundred sixty-one million, five hundred forty thousand, three hundred sixteen".