861685872008 has 16 divisors (see below), whose sum is σ = 1739942626380. Its totient is φ = 397701171648.

The previous prime is 861685872001. The next prime is 861685872023. The reversal of 861685872008 is 800278586168.

It can be written as a sum of positive squares in 2 ways, for example, as 856665015844 + 5020856164 = 925562^2 + 70858^2 .

It is not an unprimeable number, because it can be changed into a prime (861685872001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4142720435 + ... + 4142720642.

Almost surely, 2^861685872008 is an apocalyptic number.

It is an amenable number.

861685872008 is an abundant number, since it is smaller than the sum of its proper divisors (878256754372).

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

861685872008 is a wasteful number, since it uses less digits than its factorization.

861685872008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8285441096 (or 8285441092 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 59.

The spelling of 861685872008 in words is "eight hundred sixty-one billion, six hundred eighty-five million, eight hundred seventy-two thousand, eight".