668895688867 has 8 divisors (see below), whose sum is σ = 764712345600. Its totient is φ = 573144064584.

The previous prime is 668895688847. The next prime is 668895688913. The reversal of 668895688867 is 768886598866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-668895688867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668895688837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16236067 + ... + 16277212.

It is an arithmetic number, because the mean of its divisors is an integer number (95589043200).

Almost surely, 2^668895688867 is an apocalyptic number.

668895688867 is a deficient number, since it is larger than the sum of its proper divisors (95816656733).

668895688867 is a wasteful number, since it uses less digits than its factorization.

668895688867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32516225.

The product of its digits is 13377208320, while the sum is 85.

Subtracting 668895688867 from its reverse (768886598866), we obtain a palindrome (99990909999).

The spelling of 668895688867 in words is "six hundred sixty-eight billion, eight hundred ninety-five million, six hundred eighty-eight thousand, eight hundred sixty-seven".