16668535187 has 4 divisors (see below), whose sum is σ = 17119036176. Its totient is φ = 16218034200.

The previous prime is 16668535181. The next prime is 16668535253. The reversal of 16668535187 is 78153586661.

16668535187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16668535187 - 2¹⁰ = 16668534163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16668535181) 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, 225250439 + ... + 225250512.

It is an arithmetic number, because the mean of its divisors is an integer number (4279759044).

Almost surely, 2^16668535187 is an apocalyptic number.

16668535187 is a deficient number, since it is larger than the sum of its proper divisors (450500989).

16668535187 is an equidigital number, since it uses as much as digits as its factorization.

16668535187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450500988.

The product of its digits is 7257600, while the sum is 56.

The spelling of 16668535187 in words is "sixteen billion, six hundred sixty-eight million, five hundred thirty-five thousand, one hundred eighty-seven".