159666861 has 16 divisors (see below), whose sum is σ = 225815040. Its totient is φ = 100067760.

The previous prime is 159666847. The next prime is 159666883. The reversal of 159666861 is 168666951.

It is not a de Polignac number, because 159666861 - 2⁷ = 159666733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 159666861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159664861) 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, 3225 + ... + 18158.

It is an arithmetic number, because the mean of its divisors is an integer number (14113440).

Almost surely, 2^159666861 is an apocalyptic number.

It is an amenable number.

159666861 is a deficient number, since it is larger than the sum of its proper divisors (66148179).

159666861 is a wasteful number, since it uses less digits than its factorization.

159666861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21536.

The product of its digits is 466560, while the sum is 48.

The square root of 159666861 is about 12635.9353037280. The cubic root of 159666861 is about 542.5064788597.

The spelling of 159666861 in words is "one hundred fifty-nine million, six hundred sixty-six thousand, eight hundred sixty-one".