6538128063 has 4 divisors (see below), whose sum is σ = 8717504088. Its totient is φ = 4358752040.

The previous prime is 6538128049. The next prime is 6538128083. The reversal of 6538128063 is 3608218356.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6538128063 - 2⁹ = 6538127551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6538128083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089688008 + ... + 1089688013.

It is an arithmetic number, because the mean of its divisors is an integer number (2179376022).

Almost surely, 2^6538128063 is an apocalyptic number.

6538128063 is a deficient number, since it is larger than the sum of its proper divisors (2179376025).

6538128063 is a wasteful number, since it uses less digits than its factorization.

6538128063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179376024.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 6538128063 is about 80858.6919446512. The cubic root of 6538128063 is about 1869.8975286772.

The spelling of 6538128063 in words is "six billion, five hundred thirty-eight million, one hundred twenty-eight thousand, sixty-three".