660859 has 8 divisors (see below), whose sum is σ = 702720. Its totient is φ = 620136.

The previous prime is 660853. The next prime is 660887. The reversal of 660859 is 958066.

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 660859 - 2³ = 660851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660851) 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, 1114 + ... + 1600.

It is an arithmetic number, because the mean of its divisors is an integer number (87840).

2⁶⁶⁰⁸⁵⁹ is an apocalyptic number.

660859 is a deficient number, since it is larger than the sum of its proper divisors (41861).

660859 is a wasteful number, since it uses less digits than its factorization.

660859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 660859 is about 812.9323465086. The cubic root of 660859 is about 87.1036330557.

The spelling of 660859 in words is "six hundred sixty thousand, eight hundred fifty-nine".