618666 has 16 divisors (see below), whose sum is σ = 1251264. Its totient is φ = 203904.

The previous prime is 618643. The next prime is 618671. The reversal of 618666 is 666816.

618666 is a modest number, since divided by 666 gives 618 as remainder.

It is an unprimeable number.

618666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51 + ... + 1113.

It is an arithmetic number, because the mean of its divisors is an integer number (78204).

2⁶¹⁸⁶⁶⁶ is an apocalyptic number.

618666 is an abundant number, since it is smaller than the sum of its proper divisors (632598).

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

618666 is a wasteful number, since it uses less digits than its factorization.

618666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165.

The product of its digits is 10368, while the sum is 33.

The square root of 618666 is about 786.5532404103. The cubic root of 618666 is about 85.2089897720.

The spelling of 618666 in words is "six hundred eighteen thousand, six hundred sixty-six".