668632236866 has 16 divisors (see below), whose sum is σ = 1094294272608. Its totient is φ = 303876856800.

The previous prime is 668632236851. The next prime is 668632236931.

668632236866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 668632236799 and 668632236808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2198315 + ... + 2483918.

It is an arithmetic number, because the mean of its divisors is an integer number (68393392038).

Almost surely, 2^668632236866 is an apocalyptic number.

668632236866 is a deficient number, since it is larger than the sum of its proper divisors (425662035742).

668632236866 is a wasteful number, since it uses less digits than its factorization.

668632236866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4688737.

The product of its digits is 107495424, while the sum is 62.

The spelling of 668632236866 in words is "six hundred sixty-eight billion, six hundred thirty-two million, two hundred thirty-six thousand, eight hundred sixty-six".