159666573889 has 3 divisors (see below), whose sum is σ = 159666973473. Its totient is φ = 159666174306.

The previous prime is 159666573887. The next prime is 159666573991. The reversal of 159666573889 is 988375666951.

The square root of 159666573889 is 399583.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 159666573889 - 2¹ = 159666573887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159666573881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 199792 + ... + 599374.

It is an arithmetic number, because the mean of its divisors is an integer number (53222324491).

Almost surely, 2^159666573889 is an apocalyptic number.

159666573889 is the 399583-rd square number.

159666573889 is the 199792-nd centered octagonal number.

It is an amenable number.

159666573889 is a deficient number, since it is larger than the sum of its proper divisors (399584).

159666573889 is an frugal number, since it uses more digits than its factorization.

159666573889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799166 (or 399583 counting only the distinct ones).

The product of its digits is 587865600, while the sum is 73.

The spelling of 159666573889 in words is "one hundred fifty-nine billion, six hundred sixty-six million, five hundred seventy-three thousand, eight hundred eighty-nine".