668334874438 has 32 divisors (see below), whose sum is σ = 1290191505408. Its totient is φ = 251990524800.

The previous prime is 668334874411. The next prime is 668334874447. The reversal of 668334874438 is 834478433866.

It is a self number, because there is not a number n which added to its sum of digits gives 668334874438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69992595 + ... + 70002142.

It is an arithmetic number, because the mean of its divisors is an integer number (40318484544).

Almost surely, 2^668334874438 is an apocalyptic number.

668334874438 is a deficient number, since it is larger than the sum of its proper divisors (621856630970).

668334874438 is a wasteful number, since it uses less digits than its factorization.

668334874438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139994788.

The product of its digits is 222953472, while the sum is 64.

The spelling of 668334874438 in words is "six hundred sixty-eight billion, three hundred thirty-four million, eight hundred seventy-four thousand, four hundred thirty-eight".