668478301811 has 4 divisors (see below), whose sum is σ = 668480466192. Its totient is φ = 668476137432.

The previous prime is 668478301783. The next prime is 668478301849. The reversal of 668478301811 is 118103874866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668478301811 - 2¹⁴ = 668478285427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668478301111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522380 + ... + 1268793.

It is an arithmetic number, because the mean of its divisors is an integer number (167120116548).

Almost surely, 2^668478301811 is an apocalyptic number.

668478301811 is a deficient number, since it is larger than the sum of its proper divisors (2164381).

668478301811 is a wasteful number, since it uses less digits than its factorization.

668478301811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164380.

The product of its (nonzero) digits is 1548288, while the sum is 53.

The spelling of 668478301811 in words is "six hundred sixty-eight billion, four hundred seventy-eight million, three hundred one thousand, eight hundred eleven".