159660565 has 4 divisors (see below), whose sum is σ = 191592684. Its totient is φ = 127728448.

The previous prime is 159660541. The next prime is 159660581. The reversal of 159660565 is 565066951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74891716 + 84768849 = 8654^2 + 9207^2 .

It is a cyclic number.

It is not a de Polignac number, because 159660565 - 2²³ = 151271957 is a prime.

It is a super-2 number, since 2×159660565² = 50982992032238450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15966052 + ... + 15966061.

It is an arithmetic number, because the mean of its divisors is an integer number (47898171).

Almost surely, 2^159660565 is an apocalyptic number.

It is an amenable number.

159660565 is a deficient number, since it is larger than the sum of its proper divisors (31932119).

159660565 is an equidigital number, since it uses as much as digits as its factorization.

159660565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31932118.

The product of its (nonzero) digits is 243000, while the sum is 43.

The square root of 159660565 is about 12635.6861705251. The cubic root of 159660565 is about 542.4993480423.

The spelling of 159660565 in words is "one hundred fifty-nine million, six hundred sixty thousand, five hundred sixty-five".