668531135866 has 16 divisors (see below), whose sum is σ = 1094427429408. Its totient is φ = 303747958800.

The previous prime is 668531135821. The next prime is 668531135869.

668531135866 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 668531135866.

It is not an unprimeable number, because it can be changed into a prime (668531135869) 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, 6438840 + ... + 6541843.

It is an arithmetic number, because the mean of its divisors is an integer number (68401714338).

Almost surely, 2^668531135866 is an apocalyptic number.

668531135866 is a deficient number, since it is larger than the sum of its proper divisors (425896293542).

668531135866 is a wasteful number, since it uses less digits than its factorization.

668531135866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12983037.

The product of its digits is 18662400, while the sum is 58.

The spelling of 668531135866 in words is "six hundred sixty-eight billion, five hundred thirty-one million, one hundred thirty-five thousand, eight hundred sixty-six".