6541880660 has 24 divisors (see below), whose sum is σ = 15700513920. Its totient is φ = 2242930464.

The previous prime is 6541880659. The next prime is 6541880669. The reversal of 6541880660 is 660881456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541880669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23363720 + ... + 23363999.

It is an arithmetic number, because the mean of its divisors is an integer number (654188080).

Almost surely, 2^6541880660 is an apocalyptic number.

It is an amenable number.

6541880660 is an abundant number, since it is smaller than the sum of its proper divisors (9158633260).

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

6541880660 is a wasteful number, since it uses less digits than its factorization.

6541880660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46727735 (or 46727733 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 6541880660 is about 80881.8932765548. The cubic root of 6541880660 is about 1870.2552064783.

The spelling of 6541880660 in words is "six billion, five hundred forty-one million, eight hundred eighty thousand, six hundred sixty".