6539947512 has 128 divisors (see below), whose sum is σ = 19829145600. Its totient is φ = 1756960128.

The previous prime is 6539947501. The next prime is 6539947553. The reversal of 6539947512 is 2157499356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 213633 + ... + 242319.

It is an arithmetic number, because the mean of its divisors is an integer number (154915200).

Almost surely, 2^6539947512 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 6539947512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9914572800).

6539947512 is an abundant number, since it is smaller than the sum of its proper divisors (13289198088).

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

6539947512 is a wasteful number, since it uses less digits than its factorization.

6539947512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28785 (or 28781 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 51.

The square root of 6539947512 is about 80869.9419562052. The cubic root of 6539947512 is about 1870.0709660696.

The spelling of 6539947512 in words is "six billion, five hundred thirty-nine million, nine hundred forty-seven thousand, five hundred twelve".