638223536327 has 4 divisors (see below), whose sum is σ = 687317654520. Its totient is φ = 589129418136.

The previous prime is 638223536323. The next prime is 638223536333. The reversal of 638223536327 is 723635322836.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 638223536327 - 2² = 638223536323 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 (638223536323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24547059077 + ... + 24547059102.

It is an arithmetic number, because the mean of its divisors is an integer number (171829413630).

Almost surely, 2^638223536327 is an apocalyptic number.

638223536327 is a deficient number, since it is larger than the sum of its proper divisors (49094118193).

638223536327 is a wasteful number, since it uses less digits than its factorization.

638223536327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49094118192.

The product of its digits is 6531840, while the sum is 50.

The spelling of 638223536327 in words is "six hundred thirty-eight billion, two hundred twenty-three million, five hundred thirty-six thousand, three hundred twenty-seven".