6603666 has 8 divisors (see below), whose sum is σ = 13207344. Its totient is φ = 2201220.

The previous prime is 6603647. The next prime is 6603671. The reversal of 6603666 is 6663066.

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

6603666 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550300 + ... + 550311.

It is an arithmetic number, because the mean of its divisors is an integer number (1650918).

Almost surely, 2^6603666 is an apocalyptic number.

6603666 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.

6603666 is a wasteful number, since it uses less digits than its factorization.

6603666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100616.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 6603666 is about 2569.7599109644. The cubic root of 6603666 is about 187.6124694121.

The spelling of 6603666 in words is "six million, six hundred three thousand, six hundred sixty-six".