861086100185 has 16 divisors (see below), whose sum is σ = 1101170612736. Its totient is φ = 644898522048.

The previous prime is 861086100181. The next prime is 861086100191. The reversal of 861086100185 is 581001680168.

It is not a de Polignac number, because 861086100185 - 2² = 861086100181 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861086100181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79651034 + ... + 79661843.

It is an arithmetic number, because the mean of its divisors is an integer number (68823163296).

Almost surely, 2^861086100185 is an apocalyptic number.

It is an amenable number.

861086100185 is a deficient number, since it is larger than the sum of its proper divisors (240084512551).

861086100185 is a wasteful number, since it uses less digits than its factorization.

861086100185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159312952.

The product of its (nonzero) digits is 92160, while the sum is 44.

The spelling of 861086100185 in words is "eight hundred sixty-one billion, eighty-six million, one hundred thousand, one hundred eighty-five".