668280808887 has 4 divisors (see below), whose sum is σ = 891041078520. Its totient is φ = 445520539256.

The previous prime is 668280808873. The next prime is 668280808939. The reversal of 668280808887 is 788808082866.

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 668280808887 - 2⁶ = 668280808823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668280808847) 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 3 ways as a sum of consecutive naturals, for example, 111380134812 + ... + 111380134817.

It is an arithmetic number, because the mean of its divisors is an integer number (222760269630).

Almost surely, 2^668280808887 is an apocalyptic number.

668280808887 is a deficient number, since it is larger than the sum of its proper divisors (222760269633).

668280808887 is a wasteful number, since it uses less digits than its factorization.

668280808887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222760269632.

The product of its (nonzero) digits is 132120576, while the sum is 69.

The spelling of 668280808887 in words is "six hundred sixty-eight billion, two hundred eighty million, eight hundred eight thousand, eight hundred eighty-seven".