6539968512 has 420 divisors, whose sum is σ = 24360506016. Its totient is φ = 1698693120.

The previous prime is 6539968489. The next prime is 6539968517. The reversal of 6539968512 is 2158699356.

It is a happy number.

6539968512 is a `hidden beast` number, since 6 + 5 + 39 + 96 + 8 + 512 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6539968517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 594542587 + ... + 594542597.

Almost surely, 2^6539968512 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 6539968512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12180253008).

6539968512 is an abundant number, since it is smaller than the sum of its proper divisors (17820537504).

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

6539968512 is an frugal number, since it uses more digits than its factorization.

6539968512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70 (or 23 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The square root of 6539968512 is about 80870.0717942058. The cubic root of 6539968512 is about 1870.0729676886.

The spelling of 6539968512 in words is "six billion, five hundred thirty-nine million, nine hundred sixty-eight thousand, five hundred twelve".