16866685201687 has 16 divisors (see below), whose sum is σ = 17833342227840. Its totient is φ = 15907927570848.

The previous prime is 16866685201661. The next prime is 16866685201783. The reversal of 16866685201687 is 78610258666861.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16866685201687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16866685204687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131555748 + ... + 131683894.

It is an arithmetic number, because the mean of its divisors is an integer number (1114583889240).

Almost surely, 2^{16866685201687} is an apocalyptic number.

16866685201687 is a deficient number, since it is larger than the sum of its proper divisors (966657026153).

16866685201687 is a wasteful number, since it uses less digits than its factorization.

16866685201687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158910.

The product of its (nonzero) digits is 278691840, while the sum is 70.

The spelling of 16866685201687 in words is "sixteen trillion, eight hundred sixty-six billion, six hundred eighty-five million, two hundred one thousand, six hundred eighty-seven".