1856681668 has 12 divisors (see below), whose sum is σ = 3254968080. Its totient is φ = 926690792.

The previous prime is 1856681633. The next prime is 1856681669. The reversal of 1856681668 is 8661866581.

It is not an unprimeable number, because it can be changed into a prime (1856681669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409978 + ... + 414481.

It is an arithmetic number, because the mean of its divisors is an integer number (271247340).

Almost surely, 2^1856681668 is an apocalyptic number.

It is an amenable number.

1856681668 is a deficient number, since it is larger than the sum of its proper divisors (1398286412).

1856681668 is a wasteful number, since it uses less digits than its factorization.

1856681668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825026 (or 825024 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The square root of 1856681668 is about 43089.2291413991. The cubic root of 1856681668 is about 1229.0771644497.

The spelling of 1856681668 in words is "one billion, eight hundred fifty-six million, six hundred eighty-one thousand, six hundred sixty-eight".