159717609666 has 12 divisors (see below), whose sum is σ = 346054820982. Its totient is φ = 53239203216.

The previous prime is 159717609659. The next prime is 159717609691. The reversal of 159717609666 is 666906717951.

It can be written as a sum of positive squares in only one way, i.e., 90585950625 + 69131659041 = 300975^2 + 262929^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4436600251 + ... + 4436600286.

Almost surely, 2^159717609666 is an apocalyptic number.

159717609666 is an abundant number, since it is smaller than the sum of its proper divisors (186337211316).

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

159717609666 is a wasteful number, since it uses less digits than its factorization.

159717609666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8873200545 (or 8873200542 counting only the distinct ones).

The product of its (nonzero) digits is 25719120, while the sum is 63.

The spelling of 159717609666 in words is "one hundred fifty-nine billion, seven hundred seventeen million, six hundred nine thousand, six hundred sixty-six".