8159687856 has 30 divisors (see below), whose sum is σ = 22835793500. Its totient is φ = 2719895904.

The previous prime is 8159687849. The next prime is 8159687873. The reversal of 8159687856 is 6587869518.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 8159687793 and 8159687802.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28332106 + ... + 28332393.

Almost surely, 2^8159687856 is an apocalyptic number.

It is an amenable number.

8159687856 is an abundant number, since it is smaller than the sum of its proper divisors (14676105644).

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

8159687856 is a wasteful number, since it uses less digits than its factorization.

8159687856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56664513 (or 56664504 counting only the distinct ones).

The product of its digits is 29030400, while the sum is 63.

The square root of 8159687856 is about 90330.9905624864. The cubic root of 8159687856 is about 2013.2197479400.

The spelling of 8159687856 in words is "eight billion, one hundred fifty-nine million, six hundred eighty-seven thousand, eight hundred fifty-six".