6538165857 has 20 divisors (see below), whose sum is σ = 9856507540. Its totient is φ = 4318782624.

The previous prime is 6538165849. The next prime is 6538165871. The reversal of 6538165857 is 7585618356.

6538165857 is a `hidden beast` number, since 6 + 53 + 8 + 1 + 6 + 585 + 7 = 666.

6538165857 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5628600576 + 909565281 = 75024^2 + 30159^2 .

It is not a de Polignac number, because 6538165857 - 2³ = 6538165849 is a prime.

It is a super-3 number, since 3×6538165857³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6538165957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 361438 + ... + 379095.

It is an arithmetic number, because the mean of its divisors is an integer number (492825377).

Almost surely, 2^6538165857 is an apocalyptic number.

It is an amenable number.

6538165857 is a deficient number, since it is larger than the sum of its proper divisors (3318341683).

6538165857 is a wasteful number, since it uses less digits than its factorization.

6538165857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740654 (or 740645 counting only the distinct ones).

The product of its digits is 6048000, while the sum is 54.

The square root of 6538165857 is about 80858.9256483166. The cubic root of 6538165857 is about 1869.9011316846.

The spelling of 6538165857 in words is "six billion, five hundred thirty-eight million, one hundred sixty-five thousand, eight hundred fifty-seven".