16855859808 has 48 divisors (see below), whose sum is σ = 49162926960. Its totient is φ = 5618619648.

The previous prime is 16855859791. The next prime is 16855859809. The reversal of 16855859808 is 80895855861.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16855859809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9753685 + ... + 9755412.

It is an arithmetic number, because the mean of its divisors is an integer number (1024227645).

Almost surely, 2^16855859808 is an apocalyptic number.

16855859808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16855859808 is an abundant number, since it is smaller than the sum of its proper divisors (32307067152).

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

16855859808 is a wasteful number, since it uses less digits than its factorization.

16855859808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19509116 (or 19509102 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 63.

The spelling of 16855859808 in words is "sixteen billion, eight hundred fifty-five million, eight hundred fifty-nine thousand, eight hundred eight".