6539243256 has 288 divisors, whose sum is σ = 23494620240. Its totient is φ = 1622992896.

The previous prime is 6539243251. The next prime is 6539243257. The reversal of 6539243256 is 6523429356.

6539243256 is a `hidden beast` number, since 6 + 5 + 392 + 4 + 3 + 256 = 666.

It is a super-2 number, since 2×6539243256² = 85523404722282963072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6539243251) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 775495 + ... + 783881.

Almost surely, 2^6539243256 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 6539243256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11747310120).

6539243256 is an abundant number, since it is smaller than the sum of its proper divisors (16955376984).

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

6539243256 is a wasteful number, since it uses less digits than its factorization.

6539243256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443 (or 8429 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 45.

The square root of 6539243256 is about 80865.5875882937. The cubic root of 6539243256 is about 1870.0038372956.

The spelling of 6539243256 in words is "six billion, five hundred thirty-nine million, two hundred forty-three thousand, two hundred fifty-six".