638374333886 has 4 divisors (see below), whose sum is σ = 957561500832. Its totient is φ = 319187166942.

The previous prime is 638374333853. The next prime is 638374333889. The reversal of 638374333886 is 688333473836.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638374333889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159593583470 + ... + 159593583473.

It is an arithmetic number, because the mean of its divisors is an integer number (239390375208).

Almost surely, 2^638374333886 is an apocalyptic number.

638374333886 is a deficient number, since it is larger than the sum of its proper divisors (319187166946).

638374333886 is a wasteful number, since it uses less digits than its factorization.

638374333886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319187166945.

The product of its digits is 125411328, while the sum is 62.

The spelling of 638374333886 in words is "six hundred thirty-eight billion, three hundred seventy-four million, three hundred thirty-three thousand, eight hundred eighty-six".