16680857 has 8 divisors (see below), whose sum is σ = 16931592. Its totient is φ = 16432000.

The previous prime is 16680847. The next prime is 16680871. The reversal of 16680857 is 75808661.

It can be written as a sum of positive squares in 4 ways, for example, as 1478656 + 15202201 = 1216^2 + 3899^2 .

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 16680857 - 2⁶ = 16680793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16680827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31757 + ... + 32277.

It is an arithmetic number, because the mean of its divisors is an integer number (2116449).

Almost surely, 2^16680857 is an apocalyptic number.

It is an amenable number.

16680857 is a deficient number, since it is larger than the sum of its proper divisors (250735).

16680857 is a wasteful number, since it uses less digits than its factorization.

16680857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 16680857 is about 4084.2204886612. The cubic root of 16680857 is about 255.5089514750.

The spelling of 16680857 in words is "sixteen million, six hundred eighty thousand, eight hundred fifty-seven".