668135531866 has 16 divisors (see below), whose sum is σ = 1111235849568. Its totient is φ = 298719313200.

The previous prime is 668135531851. The next prime is 668135531879.

668135531866 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 668135531866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248931420 + ... + 248934103.

It is an arithmetic number, because the mean of its divisors is an integer number (69452240598).

Almost surely, 2^668135531866 is an apocalyptic number.

668135531866 is a deficient number, since it is larger than the sum of its proper divisors (443100317702).

668135531866 is a wasteful number, since it uses less digits than its factorization.

668135531866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497865597.

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

The spelling of 668135531866 in words is "six hundred sixty-eight billion, one hundred thirty-five million, five hundred thirty-one thousand, eight hundred sixty-six".