668486282684866 has 4 divisors (see below), whose sum is σ = 1002729424027302. Its totient is φ = 334243141342432.

The previous prime is 668486282684861. The next prime is 668486282684867.

668486282684866 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 475029478919241 + 193456803765625 = 21795171^2 + 13908875^2 .

It is not an unprimeable number, because it can be changed into a prime (668486282684861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167121570671215 + ... + 167121570671218.

Almost surely, 2^{668486282684866} is an apocalyptic number.

668486282684866 is a deficient number, since it is larger than the sum of its proper divisors (334243141342436).

668486282684866 is a wasteful number, since it uses less digits than its factorization.

668486282684866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334243141342435.

The product of its digits is 97844723712, while the sum is 88.

The spelling of 668486282684866 in words is "six hundred sixty-eight trillion, four hundred eighty-six billion, two hundred eighty-two million, six hundred eighty-four thousand, eight hundred sixty-six".