173861081856 has 864 divisors, whose sum is σ = 681152371200. Its totient is φ = 43174010880.

The previous prime is 173861081827. The next prime is 173861081887. The reversal of 173861081856 is 658180168371.

173861081856 is a `hidden beast` number, since 1 + 7 + 3 + 8 + 610 + 8 + 18 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (54).

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 95 ways as a sum of consecutive naturals, for example, 85687050 + ... + 85689078.

It is an arithmetic number, because the mean of its divisors is an integer number (788370800).

Almost surely, 2^173861081856 is an apocalyptic number.

173861081856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 173861081856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340576185600).

173861081856 is an abundant number, since it is smaller than the sum of its proper divisors (507291289344).

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

173861081856 is a wasteful number, since it uses less digits than its factorization.

173861081856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102 (or 2075 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 173861081856 in words is "one hundred seventy-three billion, eight hundred sixty-one million, eighty-one thousand, eight hundred fifty-six".