666018 has 24 divisors (see below), whose sum is σ = 1458288. Its totient is φ = 219672.

The previous prime is 666013. The next prime is 666019. The reversal of 666018 is 810666.

It is a junction number, because it is equal to n+sod(n) for n = 665982 and 666000.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666018.

It is not an unprimeable number, because it can be changed into a prime (666013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2821 + ... + 3047.

It is an arithmetic number, because the mean of its divisors is an integer number (60762).

2⁶⁶⁶⁰¹⁸ is an apocalyptic number.

666018 is an abundant number, since it is smaller than the sum of its proper divisors (792270).

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

666018 is a wasteful number, since it uses less digits than its factorization.

666018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 666018 is about 816.0992586689. The cubic root of 666018 is about 87.3297041529.

It can be divided in two parts, 66 and 6018, that added together give a square (6084 = 78²).

The spelling of 666018 in words is "six hundred sixty-six thousand, eighteen".