638823686347 has 8 divisors (see below), whose sum is σ = 796455505152. Its totient is φ = 497784690600.

The previous prime is 638823686323. The next prime is 638823686393. The reversal of 638823686347 is 743686328836.

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

It is a cyclic number.

It is not a de Polignac number, because 638823686347 - 2⁷ = 638823686219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638823686047) 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, 4148205679 + ... + 4148205832.

It is an arithmetic number, because the mean of its divisors is an integer number (99556938144).

Almost surely, 2^638823686347 is an apocalyptic number.

638823686347 is a deficient number, since it is larger than the sum of its proper divisors (157631818805).

638823686347 is a wasteful number, since it uses less digits than its factorization.

638823686347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8296411529.

The product of its digits is 167215104, while the sum is 64.

The spelling of 638823686347 in words is "six hundred thirty-eight billion, eight hundred twenty-three million, six hundred eighty-six thousand, three hundred forty-seven".