159665580 has 168 divisors, whose sum is σ = 515616192. Its totient is φ = 41492736.

The previous prime is 159665567. The next prime is 159665587. The reversal of 159665580 is 85566951.

It is a happy number.

159665580 is a `hidden beast` number, since 1 + 5 + 9 + 6 + 65 + 580 = 666.

159665580 is nontrivially palindromic in base 11.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (159665587) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 685144 + ... + 685376.

It is an arithmetic number, because the mean of its divisors is an integer number (3069144).

Almost surely, 2^159665580 is an apocalyptic number.

159665580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 159665580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257808096).

159665580 is an abundant number, since it is smaller than the sum of its proper divisors (355950612).

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

159665580 is a wasteful number, since it uses less digits than its factorization.

159665580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The square root of 159665580 is about 12635.8846148578. The cubic root of 159665580 is about 542.5050280208.

It can be divided in two parts, 1596 and 65580, that added together give a palindrome (67176).

The spelling of 159665580 in words is "one hundred fifty-nine million, six hundred sixty-five thousand, five hundred eighty".