6659605906 has 16 divisors (see below), whose sum is σ = 10533425760. Its totient is φ = 3149072640.

The previous prime is 6659605889. The next prime is 6659605919. The reversal of 6659605906 is 6095069566.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129940 + ... + 173791.

It is an arithmetic number, because the mean of its divisors is an integer number (658339110).

Almost surely, 2^6659605906 is an apocalyptic number.

6659605906 is a deficient number, since it is larger than the sum of its proper divisors (3873819854).

6659605906 is a wasteful number, since it uses less digits than its factorization.

6659605906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304329.

The product of its (nonzero) digits is 2624400, while the sum is 52.

The square root of 6659605906 is about 81606.4084860987. The cubic root of 6659605906 is about 1881.4073800324.

The spelling of 6659605906 in words is "six billion, six hundred fifty-nine million, six hundred five thousand, nine hundred six".