6509809818 has 24 divisors (see below), whose sum is σ = 14432603328. Its totient is φ = 2119472712.

The previous prime is 6509809783. The next prime is 6509809843. The reversal of 6509809818 is 8189089056.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4204530 + ... + 4206077.

It is an arithmetic number, because the mean of its divisors is an integer number (601358472).

Almost surely, 2^6509809818 is an apocalyptic number.

6509809818 is an abundant number, since it is smaller than the sum of its proper divisors (7922793510).

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

6509809818 is a wasteful number, since it uses less digits than its factorization.

6509809818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8410658 (or 8410655 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The square root of 6509809818 is about 80683.3924547053. The cubic root of 6509809818 is about 1867.1939591935.

The spelling of 6509809818 in words is "six billion, five hundred nine million, eight hundred nine thousand, eight hundred eighteen".