6539772668 has 96 divisors (see below), whose sum is σ = 13787659200. Its totient is φ = 2697235200.

The previous prime is 6539772667. The next prime is 6539772719. The reversal of 6539772668 is 8662779356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6539772667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4221158 + ... + 4222706.

It is an arithmetic number, because the mean of its divisors is an integer number (143621450).

Almost surely, 2^6539772668 is an apocalyptic number.

It is an amenable number.

6539772668 is an abundant number, since it is smaller than the sum of its proper divisors (7247886532).

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

6539772668 is a wasteful number, since it uses less digits than its factorization.

6539772668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660 (or 1636 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 59.

The square root of 6539772668 is about 80868.8609292848. The cubic root of 6539772668 is about 1870.0543006147.

The spelling of 6539772668 in words is "six billion, five hundred thirty-nine million, seven hundred seventy-two thousand, six hundred sixty-eight".