159717609665 has 8 divisors (see below), whose sum is σ = 195277379688. Its totient is φ = 125363255680.

The previous prime is 159717609659. The next prime is 159717609691. The reversal of 159717609665 is 566906717951.

It can be written as a sum of positive squares in 4 ways, for example, as 42177658384 + 117539951281 = 205372^2 + 342841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 159717609665 - 2¹⁰ = 159717608641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 159717609598 and 159717609607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301353716 + ... + 301354245.

It is an arithmetic number, because the mean of its divisors is an integer number (24409672461).

Almost surely, 2^159717609665 is an apocalyptic number.

It is an amenable number.

159717609665 is a deficient number, since it is larger than the sum of its proper divisors (35559770023).

159717609665 is an equidigital number, since it uses as much as digits as its factorization.

159717609665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602708019.

The product of its (nonzero) digits is 21432600, while the sum is 62.

The spelling of 159717609665 in words is "one hundred fifty-nine billion, seven hundred seventeen million, six hundred nine thousand, six hundred sixty-five".