609666 has 8 divisors (see below), whose sum is σ = 1219344. Its totient is φ = 203220.

The previous prime is 609641. The next prime is 609673. The reversal of 609666 is 666906.

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

609666 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 609666.

It is an unprimeable number.

609666 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 3 ways as a sum of consecutive naturals, for example, 50800 + ... + 50811.

It is an arithmetic number, because the mean of its divisors is an integer number (152418).

2⁶⁰⁹⁶⁶⁶ is an apocalyptic number.

609666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

609666 is a wasteful number, since it uses less digits than its factorization.

609666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101616.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 609666 is about 780.8111167241. The cubic root of 609666 is about 84.7937792102.

It can be divided in two parts, 609 and 666, that added together give a triangular number (1275 = T₅₀).

The spelling of 609666 in words is "six hundred nine thousand, six hundred sixty-six".