638844847359 has 8 divisors (see below), whose sum is σ = 851834348160. Its totient is φ = 425875955736.

The previous prime is 638844847349. The next prime is 638844847369. The reversal of 638844847359 is 953748448836.

It is an interprime number because it is at equal distance from previous prime (638844847349) and next prime (638844847369).

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

It is not a de Polignac number, because 638844847359 - 2⁹ = 638844846847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638844847293 and 638844847302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638844847349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5079819 + ... + 5204060.

It is an arithmetic number, because the mean of its divisors is an integer number (106479293520).

Almost surely, 2^638844847359 is an apocalyptic number.

638844847359 is a deficient number, since it is larger than the sum of its proper divisors (212989500801).

638844847359 is a wasteful number, since it uses less digits than its factorization.

638844847359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304589.

The product of its digits is 557383680, while the sum is 69.

The spelling of 638844847359 in words is "six hundred thirty-eight billion, eight hundred forty-four million, eight hundred forty-seven thousand, three hundred fifty-nine".