159666709 has 16 divisors (see below), whose sum is σ = 174254080. Its totient is φ = 145741680.

The previous prime is 159666691. The next prime is 159666733. The reversal of 159666709 is 907666951.

It is a cyclic number.

It is not a de Polignac number, because 159666709 - 2⁹ = 159666197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159666739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180382 + ... + 181264.

It is an arithmetic number, because the mean of its divisors is an integer number (10890880).

Almost surely, 2^159666709 is an apocalyptic number.

159666709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

159666709 is a deficient number, since it is larger than the sum of its proper divisors (14587371).

159666709 is a wasteful number, since it uses less digits than its factorization.

159666709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240.

The product of its (nonzero) digits is 612360, while the sum is 49.

The square root of 159666709 is about 12635.9292891342. The cubic root of 159666709 is about 542.5063067075.

The spelling of 159666709 in words is "one hundred fifty-nine million, six hundred sixty-six thousand, seven hundred nine".