159958661 has 8 divisors (see below), whose sum is σ = 169576920. Its totient is φ = 150363648.

The previous prime is 159958657. The next prime is 159958709. The reversal of 159958661 is 166859951.

It can be written as a sum of positive squares in 4 ways, for example, as 91565761 + 68392900 = 9569^2 + 8270^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 159958661 - 2² = 159958657 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 (159958621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9545 + ... + 20273.

It is an arithmetic number, because the mean of its divisors is an integer number (21197115).

Almost surely, 2^159958661 is an apocalyptic number.

It is an amenable number.

159958661 is a deficient number, since it is larger than the sum of its proper divisors (9618259).

159958661 is a wasteful number, since it uses less digits than its factorization.

159958661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11623.

The product of its digits is 583200, while the sum is 50.

The square root of 159958661 is about 12647.4764676595. The cubic root of 159958661 is about 542.8367645793.

The spelling of 159958661 in words is "one hundred fifty-nine million, nine hundred fifty-eight thousand, six hundred sixty-one".