6561853860 has 48 divisors (see below), whose sum is σ = 18465552000. Its totient is φ = 1741031424.

The previous prime is 6561853849. The next prime is 6561853877. The reversal of 6561853860 is 683581656.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 262845 + ... + 286724.

It is an arithmetic number, because the mean of its divisors is an integer number (384699000).

Almost surely, 2^6561853860 is an apocalyptic number.

6561853860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6561853860 is an abundant number, since it is smaller than the sum of its proper divisors (11903698140).

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

6561853860 is a wasteful number, since it uses less digits than its factorization.

6561853860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549780 (or 549778 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 48.

The square root of 6561853860 is about 81005.2705692660. The cubic root of 6561853860 is about 1872.1566489466.

The spelling of 6561853860 in words is "six billion, five hundred sixty-one million, eight hundred fifty-three thousand, eight hundred sixty".