16855171890 has 64 divisors (see below), whose sum is σ = 43003232640. Its totient is φ = 4215974400.

The previous prime is 16855171889. The next prime is 16855171901. The reversal of 16855171890 is 9817155861.

16855171890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 31 ways as a sum of consecutive naturals, for example, 88819 + ... + 203958.

It is an arithmetic number, because the mean of its divisors is an integer number (671925510).

Almost surely, 2^16855171890 is an apocalyptic number.

16855171890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16855171890 is an abundant number, since it is smaller than the sum of its proper divisors (26148060750).

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

16855171890 is a wasteful number, since it uses less digits than its factorization.

16855171890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292907.

The product of its (nonzero) digits is 604800, while the sum is 51.

The spelling of 16855171890 in words is "sixteen billion, eight hundred fifty-five million, one hundred seventy-one thousand, eight hundred ninety".