6538165856 has 48 divisors (see below), whose sum is σ = 13298302080. Its totient is φ = 3160995840.

The previous prime is 6538165849. The next prime is 6538165871. The reversal of 6538165856 is 6585618356.

It is a super-2 number, since 2×6538165856² = 85495225521128425472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6538165798 and 6538165807.

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, 1760930 + ... + 1764638.

It is an arithmetic number, because the mean of its divisors is an integer number (277047960).

Almost surely, 2^6538165856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6538165856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6649151040).

6538165856 is an abundant number, since it is smaller than the sum of its proper divisors (6760136224).

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

6538165856 is a wasteful number, since it uses less digits than its factorization.

6538165856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5527 (or 5519 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 53.

The square root of 6538165856 is about 80858.9256421330. The cubic root of 6538165856 is about 1869.9011315893.

The spelling of 6538165856 in words is "six billion, five hundred thirty-eight million, one hundred sixty-five thousand, eight hundred fifty-six".