159321816 has 80 divisors (see below), whose sum is σ = 454766400. Its totient is φ = 52094016.

The previous prime is 159321793. The next prime is 159321829. The reversal of 159321816 is 618123951.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32025 + ... + 36663.

It is an arithmetic number, because the mean of its divisors is an integer number (5684580).

Almost surely, 2^159321816 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 159321816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227383200).

159321816 is an abundant number, since it is smaller than the sum of its proper divisors (295444584).

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

159321816 is a wasteful number, since it uses less digits than its factorization.

159321816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4710 (or 4697 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 159321816 is about 12622.2745969179. The cubic root of 159321816 is about 542.1154059523.

It can be divided in two parts, 1593 and 21816, that added together give a square (23409 = 153²).

The spelling of 159321816 in words is "one hundred fifty-nine million, three hundred twenty-one thousand, eight hundred sixteen".