668040440344 has 32 divisors (see below), whose sum is σ = 1361033164800. Its totient is φ = 306232457760.

The previous prime is 668040440297. The next prime is 668040440387. The reversal of 668040440344 is 443044040866.

It is a self number, because there is not a number n which added to its sum of digits gives 668040440344.

It is a congruent number.

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, 70882432 + ... + 70891855.

It is an arithmetic number, because the mean of its divisors is an integer number (42532286400).

Almost surely, 2^668040440344 is an apocalyptic number.

It is an amenable number.

668040440344 is an abundant number, since it is smaller than the sum of its proper divisors (692992724456).

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

668040440344 is a wasteful number, since it uses less digits than its factorization.

668040440344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141774343 (or 141774339 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 43.

The spelling of 668040440344 in words is "six hundred sixty-eight billion, forty million, four hundred forty thousand, three hundred forty-four".