161550324918 has 12 divisors (see below), whose sum is σ = 350025704028. Its totient is φ = 53850108300.

The previous prime is 161550324869. The next prime is 161550324941. The reversal of 161550324918 is 819423055161.

It is a happy number.

161550324918 is a `hidden beast` number, since 1 + 6 + 1 + 550 + 3 + 2 + 4 + 91 + 8 = 666.

161550324918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161550324918² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4487509008 + ... + 4487509043.

It is an arithmetic number, because the mean of its divisors is an integer number (29168808669).

Almost surely, 2^161550324918 is an apocalyptic number.

161550324918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161550324918 is an abundant number, since it is smaller than the sum of its proper divisors (188475379110).

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

161550324918 is a wasteful number, since it uses less digits than its factorization.

161550324918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8975018059 (or 8975018056 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 161550324918 in words is "one hundred sixty-one billion, five hundred fifty million, three hundred twenty-four thousand, nine hundred eighteen".