638421541151 has 32 divisors (see below), whose sum is σ = 692019599040. Its totient is φ = 586812635136.

The previous prime is 638421541123. The next prime is 638421541159. The reversal of 638421541151 is 151145124836.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-638421541151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638421541099 and 638421541108.

It is a congruent number.

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

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 31 ways as a sum of consecutive naturals, for example, 43633505 + ... + 43648133.

It is an arithmetic number, because the mean of its divisors is an integer number (21625612470).

Almost surely, 2^638421541151 is an apocalyptic number.

638421541151 is a deficient number, since it is larger than the sum of its proper divisors (53598057889).

638421541151 is a wasteful number, since it uses less digits than its factorization.

638421541151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15083.

The product of its digits is 115200, while the sum is 41.

Adding to 638421541151 its reverse (151145124836), we get a palindrome (789566665987).

The spelling of 638421541151 in words is "six hundred thirty-eight billion, four hundred twenty-one million, five hundred forty-one thousand, one hundred fifty-one".