668205318126 has 64 divisors (see below), whose sum is σ = 1490750956800. Its totient is φ = 198766713600.

The previous prime is 668205318113. The next prime is 668205318149. The reversal of 668205318126 is 621813502866.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2329320 + ... + 2600411.

It is an arithmetic number, because the mean of its divisors is an integer number (23292983700).

Almost surely, 2^668205318126 is an apocalyptic number.

668205318126 is an abundant number, since it is smaller than the sum of its proper divisors (822545638674).

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

668205318126 is a wasteful number, since it uses less digits than its factorization.

668205318126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4929825.

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 668205318126 in words is "six hundred sixty-eight billion, two hundred five million, three hundred eighteen thousand, one hundred twenty-six".