6663905 has 8 divisors (see below), whose sum is σ = 8344512. Its totient is φ = 5099248.

The previous prime is 6663901. The next prime is 6663907. The reversal of 6663905 is 5093666.

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

It is a cyclic number.

It is not a de Polignac number, because 6663905 - 2² = 6663901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6663901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28859 + ... + 29088.

It is an arithmetic number, because the mean of its divisors is an integer number (1043064).

Almost surely, 2^6663905 is an apocalyptic number.

It is an amenable number.

6663905 is a deficient number, since it is larger than the sum of its proper divisors (1680607).

6663905 is a wasteful number, since it uses less digits than its factorization.

6663905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57975.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 6663905 is about 2581.4540476251. The cubic root of 6663905 is about 188.1812139085.

The spelling of 6663905 in words is "six million, six hundred sixty-three thousand, nine hundred five".