668055555609 has 16 divisors (see below), whose sum is σ = 985185187392. Its totient is φ = 399999999168.

The previous prime is 668055555569. The next prime is 668055555613. The reversal of 668055555609 is 906555550866.

It is not a de Polignac number, because 668055555609 - 2⁷ = 668055555481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (668055555619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231480039 + ... + 231482924.

It is an arithmetic number, because the mean of its divisors is an integer number (61574074212).

Almost surely, 2^668055555609 is an apocalyptic number.

It is an amenable number.

668055555609 is a deficient number, since it is larger than the sum of its proper divisors (317129631783).

668055555609 is a wasteful number, since it uses less digits than its factorization.

668055555609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462963016.

The product of its (nonzero) digits is 48600000, while the sum is 60.

The spelling of 668055555609 in words is "six hundred sixty-eight billion, fifty-five million, five hundred fifty-five thousand, six hundred nine".