1680017857 has 8 divisors (see below), whose sum is σ = 1943153856. Its totient is φ = 1422665232.

The previous prime is 1680017803. The next prime is 1680017863. The reversal of 1680017857 is 7587100861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1680017857 - 2²⁷ = 1545800129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1680017887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1445218 + ... + 1446379.

It is an arithmetic number, because the mean of its divisors is an integer number (242894232).

Almost surely, 2^1680017857 is an apocalyptic number.

It is an amenable number.

1680017857 is a deficient number, since it is larger than the sum of its proper divisors (263135999).

1680017857 is an equidigital number, since it uses as much as digits as its factorization.

1680017857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2891687.

The product of its (nonzero) digits is 94080, while the sum is 43.

The square root of 1680017857 is about 40988.0208963546. The cubic root of 1680017857 is about 1188.7886024668.

The spelling of 1680017857 in words is "one billion, six hundred eighty million, seventeen thousand, eight hundred fifty-seven".