668265968447 has 16 divisors (see below), whose sum is σ = 833650444800. Its totient is φ = 520421929440.

The previous prime is 668265968441. The next prime is 668265968473. The reversal of 668265968447 is 744869562866.

It is a de Polignac number, because none of the positive numbers 2^k-668265968447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668265968441) 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, 2407547 + ... + 2670732.

It is an arithmetic number, because the mean of its divisors is an integer number (52103152800).

Almost surely, 2^668265968447 is an apocalyptic number.

668265968447 is a deficient number, since it is larger than the sum of its proper divisors (165384476353).

668265968447 is a wasteful number, since it uses less digits than its factorization.

668265968447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5080006.

The product of its digits is 836075520, while the sum is 71.

The spelling of 668265968447 in words is "six hundred sixty-eight billion, two hundred sixty-five million, nine hundred sixty-eight thousand, four hundred forty-seven".