638841144742 has 8 divisors (see below), whose sum is σ = 971758361232. Its totient is φ = 314921691000.

The previous prime is 638841144737. The next prime is 638841144743. The reversal of 638841144742 is 247441148836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 638841144742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638841144743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2249440509 + ... + 2249440792.

It is an arithmetic number, because the mean of its divisors is an integer number (121469795154).

Almost surely, 2^638841144742 is an apocalyptic number.

638841144742 is a deficient number, since it is larger than the sum of its proper divisors (332917216490).

638841144742 is a wasteful number, since it uses less digits than its factorization.

638841144742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4498881374.

The product of its digits is 4128768, while the sum is 52.

The spelling of 638841144742 in words is "six hundred thirty-eight billion, eight hundred forty-one million, one hundred forty-four thousand, seven hundred forty-two".