861817173005 has 16 divisors (see below), whose sum is σ = 1036751486400. Its totient is φ = 687740148480.

The previous prime is 861817172989. The next prime is 861817173013. The reversal of 861817173005 is 500371718168.

It is not a de Polignac number, because 861817173005 - 2⁴ = 861817172989 is a prime.

It is a Curzon number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 38706566 + ... + 38728824.

It is an arithmetic number, because the mean of its divisors is an integer number (64796967900).

Almost surely, 2^861817173005 is an apocalyptic number.

It is an amenable number.

861817173005 is a deficient number, since it is larger than the sum of its proper divisors (174934313395).

861817173005 is a wasteful number, since it uses less digits than its factorization.

861817173005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41164.

The product of its (nonzero) digits is 282240, while the sum is 47.

The spelling of 861817173005 in words is "eight hundred sixty-one billion, eight hundred seventeen million, one hundred seventy-three thousand, five".