638815374118 has 8 divisors (see below), whose sum is σ = 958874474880. Its totient is φ = 319190549160.

The previous prime is 638815374089. The next prime is 638815374173. The reversal of 638815374118 is 811473518836.

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

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 108565273 + ... + 108571156.

It is an arithmetic number, because the mean of its divisors is an integer number (119859309360).

Almost surely, 2^638815374118 is an apocalyptic number.

638815374118 is a deficient number, since it is larger than the sum of its proper divisors (320059100762).

638815374118 is a wasteful number, since it uses less digits than its factorization.

638815374118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217137902.

The product of its digits is 3870720, while the sum is 55.

The spelling of 638815374118 in words is "six hundred thirty-eight billion, eight hundred fifteen million, three hundred seventy-four thousand, one hundred eighteen".