638985342813 has 8 divisors (see below), whose sum is σ = 852226921728. Its totient is φ = 425866996224.

The previous prime is 638985342797. The next prime is 638985342833. The reversal of 638985342813 is 318243589836.

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

It is not a de Polignac number, because 638985342813 - 2⁴ = 638985342797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638985342833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30795981 + ... + 30816722.

It is an arithmetic number, because the mean of its divisors is an integer number (106528365216).

Almost surely, 2^638985342813 is an apocalyptic number.

It is an amenable number.

638985342813 is a deficient number, since it is larger than the sum of its proper divisors (213241578915).

638985342813 is a wasteful number, since it uses less digits than its factorization.

638985342813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61616163.

The product of its digits is 29859840, while the sum is 60.

The spelling of 638985342813 in words is "six hundred thirty-eight billion, nine hundred eighty-five million, three hundred forty-two thousand, eight hundred thirteen".