16555556856 has 32 divisors (see below), whose sum is σ = 41417740800. Its totient is φ = 5514672480.

The previous prime is 16555556839. The next prime is 16555556867. The reversal of 16555556856 is 65865555561.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16555556796 and 16555556805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205150 + ... + 274221.

It is an arithmetic number, because the mean of its divisors is an integer number (1294304400).

Almost surely, 2^16555556856 is an apocalyptic number.

It is an amenable number.

16555556856 is an abundant number, since it is smaller than the sum of its proper divisors (24862183944).

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

16555556856 is a wasteful number, since it uses less digits than its factorization.

16555556856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480819 (or 480815 counting only the distinct ones).

The product of its digits is 27000000, while the sum is 57.

The spelling of 16555556856 in words is "sixteen billion, five hundred fifty-five million, five hundred fifty-six thousand, eight hundred fifty-six".