638421541153 has 16 divisors (see below), whose sum is σ = 750183985152. Its totient is φ = 537241122000.

The previous prime is 638421541123. The next prime is 638421541159. The reversal of 638421541153 is 351145124836.

It is a de Polignac number, because none of the positive numbers 2^k-638421541153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638421541159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40692243 + ... + 40707928.

It is an arithmetic number, because the mean of its divisors is an integer number (46886499072).

Almost surely, 2^638421541153 is an apocalyptic number.

It is an amenable number.

638421541153 is a deficient number, since it is larger than the sum of its proper divisors (111762443999).

638421541153 is a wasteful number, since it uses less digits than its factorization.

638421541153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81400236.

The product of its digits is 345600, while the sum is 43.

Adding to 638421541153 its reverse (351145124836), we get a palindrome (989566665989).

The spelling of 638421541153 in words is "six hundred thirty-eight billion, four hundred twenty-one million, five hundred forty-one thousand, one hundred fifty-three".