6538486638 has 16 divisors (see below), whose sum is σ = 13223906640. Its totient is φ = 2155006656.

The previous prime is 6538486627. The next prime is 6538486657. The reversal of 6538486638 is 8366848356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6121645 + ... + 6122712.

It is an arithmetic number, because the mean of its divisors is an integer number (826494165).

Almost surely, 2^6538486638 is an apocalyptic number.

6538486638 is an abundant number, since it is smaller than the sum of its proper divisors (6685420002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6538486638 is a wasteful number, since it uses less digits than its factorization.

6538486638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12244451.

The product of its digits is 19906560, while the sum is 57.

The square root of 6538486638 is about 80860.9092083437. The cubic root of 6538486638 is about 1869.9317120726.

The spelling of 6538486638 in words is "six billion, five hundred thirty-eight million, four hundred eighty-six thousand, six hundred thirty-eight".