638841144044 has 12 divisors (see below), whose sum is σ = 1118079294024. Its totient is φ = 319389917184.

The previous prime is 638841144037. The next prime is 638841144107. The reversal of 638841144044 is 440441148836.

It is a self number, because there is not a number n which added to its sum of digits gives 638841144044.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7616789 + ... + 7700204.

It is an arithmetic number, because the mean of its divisors is an integer number (93173274502).

Almost surely, 2^638841144044 is an apocalyptic number.

It is an amenable number.

638841144044 is a deficient number, since it is larger than the sum of its proper divisors (479238149980).

638841144044 is a wasteful number, since it uses less digits than its factorization.

638841144044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15327424 (or 15327422 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 47.

The spelling of 638841144044 in words is "six hundred thirty-eight billion, eight hundred forty-one million, one hundred forty-four thousand, forty-four".