159720641 has 8 divisors (see below), whose sum is σ = 164180520. Its totient is φ = 155314432.

The previous prime is 159720629. The next prime is 159720679. The reversal of 159720641 is 146027951.

It can be written as a sum of positive squares in 4 ways, for example, as 38390416 + 121330225 = 6196^2 + 11015^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 159720641 - 2⁶ = 159720577 is a prime.

It is a super-2 number, since 2×159720641² = 51021366322901762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159720941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7346 + ... + 19323.

It is an arithmetic number, because the mean of its divisors is an integer number (20522565).

Almost surely, 2^159720641 is an apocalyptic number.

It is an amenable number.

159720641 is a deficient number, since it is larger than the sum of its proper divisors (4459879).

159720641 is a wasteful number, since it uses less digits than its factorization.

159720641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26835.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 159720641 is about 12638.0631823076. The cubic root of 159720641 is about 542.5673821745.

The spelling of 159720641 in words is "one hundred fifty-nine million, seven hundred twenty thousand, six hundred forty-one".