1685036666856 has 64 divisors (see below), whose sum is σ = 4246240320000. Its totient is φ = 557207389376.

The previous prime is 1685036666839. The next prime is 1685036666867. The reversal of 1685036666856 is 6586666305861.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1331965 + ... + 2268083.

It is an arithmetic number, because the mean of its divisors is an integer number (66347505000).

Almost surely, 2^{1685036666856} is an apocalyptic number.

It is an amenable number.

1685036666856 is an abundant number, since it is smaller than the sum of its proper divisors (2561203653144).

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

1685036666856 is a wasteful number, since it uses less digits than its factorization.

1685036666856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936726 (or 936722 counting only the distinct ones).

The product of its (nonzero) digits is 223948800, while the sum is 66.

The spelling of 1685036666856 in words is "one trillion, six hundred eighty-five billion, thirty-six million, six hundred sixty-six thousand, eight hundred fifty-six".