668349943866 has 48 divisors (see below), whose sum is σ = 1579843474560. Its totient is φ = 202516536960.

The previous prime is 668349943819. The next prime is 668349943883.

668349943866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 668349943794 and 668349943803.

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 23 ways as a sum of consecutive naturals, for example, 3026290 + ... + 3239618.

It is an arithmetic number, because the mean of its divisors is an integer number (32913405720).

Almost surely, 2^668349943866 is an apocalyptic number.

668349943866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

668349943866 is an abundant number, since it is smaller than the sum of its proper divisors (911493530694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668349943866 is a wasteful number, since it uses less digits than its factorization.

668349943866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229171 (or 229168 counting only the distinct ones).

The product of its digits is 967458816, while the sum is 72.

The spelling of 668349943866 in words is "six hundred sixty-eight billion, three hundred forty-nine million, nine hundred forty-three thousand, eight hundred sixty-six".