666242 has 16 divisors (see below), whose sum is σ = 1047552. Its totient is φ = 317520.

The previous prime is 666233. The next prime is 666269. The reversal of 666242 is 242666.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 5183 + ... + 5309.

It is an arithmetic number, because the mean of its divisors is an integer number (65472).

2⁶⁶⁶²⁴² is an apocalyptic number.

666242 is a deficient number, since it is larger than the sum of its proper divisors (381310).

666242 is a wasteful number, since it uses less digits than its factorization.

666242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233.

The product of its digits is 3456, while the sum is 26.

The square root of 666242 is about 816.2364853399. The cubic root of 666242 is about 87.3394935085.

The spelling of 666242 in words is "six hundred sixty-six thousand, two hundred forty-two".