509804354856 has 16 divisors (see below), whose sum is σ = 1274510887200. Its totient is φ = 169934784944.

The previous prime is 509804354833. The next prime is 509804354881. The reversal of 509804354856 is 658453408905.

It is a junction number, because it is equal to n+sod(n) for n = 509804354796 and 509804354805.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10620924036 + ... + 10620924083.

It is an arithmetic number, because the mean of its divisors is an integer number (79656930450).

Almost surely, 2^509804354856 is an apocalyptic number.

It is an amenable number.

509804354856 is an abundant number, since it is smaller than the sum of its proper divisors (764706532344).

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

509804354856 is a wasteful number, since it uses less digits than its factorization.

509804354856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21241848128 (or 21241848124 counting only the distinct ones).

The product of its (nonzero) digits is 20736000, while the sum is 57.

The spelling of 509804354856 in words is "five hundred nine billion, eight hundred four million, three hundred fifty-four thousand, eight hundred fifty-six".