638375013656 has 16 divisors (see below), whose sum is σ = 1235564543040. Its totient is φ = 308891135520.

The previous prime is 638375013643. The next prime is 638375013659. The reversal of 638375013656 is 656310573836.

It is a junction number, because it is equal to n+sod(n) for n = 638375013598 and 638375013607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638375013659) 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, 1287046151 + ... + 1287046646.

It is an arithmetic number, because the mean of its divisors is an integer number (77222783940).

Almost surely, 2^638375013656 is an apocalyptic number.

It is an amenable number.

638375013656 is a deficient number, since it is larger than the sum of its proper divisors (597189529384).

638375013656 is a wasteful number, since it uses less digits than its factorization.

638375013656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574092834 (or 2574092830 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 53.

The spelling of 638375013656 in words is "six hundred thirty-eight billion, three hundred seventy-five million, thirteen thousand, six hundred fifty-six".