159669561 has 16 divisors (see below), whose sum is σ = 220774400. Its totient is φ = 102537360.

The previous prime is 159669551. The next prime is 159669569. The reversal of 159669561 is 165966951.

It is not a de Polignac number, because 159669561 - 2²³ = 151280953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 159669561.

It is not an unprimeable number, because it can be changed into a prime (159669569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16890 + ... + 24588.

It is an arithmetic number, because the mean of its divisors is an integer number (13798400).

Almost surely, 2^159669561 is an apocalyptic number.

It is an amenable number.

159669561 is a deficient number, since it is larger than the sum of its proper divisors (61104839).

159669561 is a wasteful number, since it uses less digits than its factorization.

159669561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7956.

The product of its digits is 437400, while the sum is 48.

The square root of 159669561 is about 12636.0421414302. The cubic root of 159669561 is about 542.5095368084.

The spelling of 159669561 in words is "one hundred fifty-nine million, six hundred sixty-nine thousand, five hundred sixty-one".