165856696872 has 16 divisors (see below), whose sum is σ = 414641742240. Its totient is φ = 55285565616.

The previous prime is 165856696807. The next prime is 165856696883. The reversal of 165856696872 is 278696658561.

It is a junction number, because it is equal to n+sod(n) for n = 165856696797 and 165856696806.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3455347828 + ... + 3455347875.

It is an arithmetic number, because the mean of its divisors is an integer number (25915108890).

Almost surely, 2^165856696872 is an apocalyptic number.

165856696872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165856696872 is an abundant number, since it is smaller than the sum of its proper divisors (248785045368).

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

165856696872 is a wasteful number, since it uses less digits than its factorization.

165856696872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6910695712 (or 6910695708 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 69.

The spelling of 165856696872 in words is "one hundred sixty-five billion, eight hundred fifty-six million, six hundred ninety-six thousand, eight hundred seventy-two".