660018 has 16 divisors (see below), whose sum is σ = 1352736. Its totient is φ = 214560.

The previous prime is 660013. The next prime is 660029. The reversal of 660018 is 810066.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 659976 and 660003.

It is not an unprimeable number, because it can be changed into a prime (660013) 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, 1096 + ... + 1587.

It is an arithmetic number, because the mean of its divisors is an integer number (84546).

2⁶⁶⁰⁰¹⁸ is an apocalyptic number.

660018 is an abundant number, since it is smaller than the sum of its proper divisors (692718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660018 is a wasteful number, since it uses less digits than its factorization.

660018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 660018 is about 812.4149186223. The cubic root of 660018 is about 87.0666684125.

The spelling of 660018 in words is "six hundred sixty thousand, eighteen".