668556916203 has 16 divisors (see below), whose sum is σ = 976230274176. Its totient is φ = 403609405440.

The previous prime is 668556916201. The next prime is 668556916217. The reversal of 668556916203 is 302619655866.

It is not a de Polignac number, because 668556916203 - 2¹ = 668556916201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668556916201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39406501 + ... + 39423462.

It is an arithmetic number, because the mean of its divisors is an integer number (61014392136).

Almost surely, 2^668556916203 is an apocalyptic number.

668556916203 is a deficient number, since it is larger than the sum of its proper divisors (307673357973).

668556916203 is a wasteful number, since it uses less digits than its factorization.

668556916203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78830234.

The product of its (nonzero) digits is 13996800, while the sum is 57.

The spelling of 668556916203 in words is "six hundred sixty-eight billion, five hundred fifty-six million, nine hundred sixteen thousand, two hundred three".