16685187007 has 4 divisors (see below), whose sum is σ = 16714511280. Its totient is φ = 16655862736.

The previous prime is 16685186983. The next prime is 16685187011. The reversal of 16685187007 is 70078158661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70078158661 = 7 ⋅10011165523.

It is a cyclic number.

It is not a de Polignac number, because 16685187007 - 2⁷ = 16685186879 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16685187017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14661283 + ... + 14662420.

It is an arithmetic number, because the mean of its divisors is an integer number (4178627820).

Almost surely, 2^16685187007 is an apocalyptic number.

16685187007 is a deficient number, since it is larger than the sum of its proper divisors (29324273).

16685187007 is an equidigital number, since it uses as much as digits as its factorization.

16685187007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29324272.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 16685187007 in words is "sixteen billion, six hundred eighty-five million, one hundred eighty-seven thousand, seven".