638636188005 has 48 divisors (see below), whose sum is σ = 1161410664960. Its totient is φ = 324215049600.

The previous prime is 638636187887. The next prime is 638636188027. The reversal of 638636188005 is 500881636836.

638636188005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638636188005 - 2⁹ = 638636187493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3667395 + ... + 3837584.

It is an arithmetic number, because the mean of its divisors is an integer number (24196055520).

Almost surely, 2^638636188005 is an apocalyptic number.

It is an amenable number.

638636188005 is a deficient number, since it is larger than the sum of its proper divisors (522774476955).

638636188005 is a wasteful number, since it uses less digits than its factorization.

638636188005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7505082 (or 7505079 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 638636188005 in words is "six hundred thirty-eight billion, six hundred thirty-six million, one hundred eighty-eight thousand, five".