6539311872 has 72 divisors (see below), whose sum is σ = 19337916080. Its totient is φ = 2179768320.

The previous prime is 6539311843. The next prime is 6539311873. The reversal of 6539311872 is 2781139356.

6539311872 is a `hidden beast` number, since 6 + 539 + 31 + 1 + 87 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (6539311873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466129 + ... + 479952.

Almost surely, 2^6539311872 is an apocalyptic number.

It is an amenable number.

6539311872 is an abundant number, since it is smaller than the sum of its proper divisors (12798604208).

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

6539311872 is an equidigital number, since it uses as much as digits as its factorization.

6539311872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946106 (or 946086 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 6539311872 is about 80866.0118467580. The cubic root of 6539311872 is about 1870.0103778962.

The spelling of 6539311872 in words is "six billion, five hundred thirty-nine million, three hundred eleven thousand, eight hundred seventy-two".