660003 has 8 divisors (see below), whose sum is σ = 926400. Its totient is φ = 416808.

The previous prime is 660001. The next prime is 660013. The reversal of 660003 is 300066.

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

It is not a de Polignac number, because 660003 - 2¹ = 660001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5733 + ... + 5846.

It is an arithmetic number, because the mean of its divisors is an integer number (115800).

2⁶⁶⁰⁰⁰³ is an apocalyptic number.

660003 is a deficient number, since it is larger than the sum of its proper divisors (266397).

660003 is a wasteful number, since it uses less digits than its factorization.

660003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11601.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 660003 is about 812.4056868339. The cubic root of 660003 is about 87.0660088295.

Adding to 660003 its reverse (300066), we get a palindrome (960069).

The spelling of 660003 in words is "six hundred sixty thousand, three".