638842635223 has 8 divisors (see below), whose sum is σ = 711707976000. Its totient is φ = 569366380128.

The previous prime is 638842635217. The next prime is 638842635241. The reversal of 638842635223 is 322536248836.

It is a happy number.

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

It is not a de Polignac number, because 638842635223 - 2⁹ = 638842634711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638842635203) 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, 847271023 + ... + 847271776.

It is an arithmetic number, because the mean of its divisors is an integer number (88963497000).

Almost surely, 2^638842635223 is an apocalyptic number.

638842635223 is a deficient number, since it is larger than the sum of its proper divisors (72865340777).

638842635223 is a wasteful number, since it uses less digits than its factorization.

638842635223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694542841.

The product of its digits is 9953280, while the sum is 52.

The spelling of 638842635223 in words is "six hundred thirty-eight billion, eight hundred forty-two million, six hundred thirty-five thousand, two hundred twenty-three".