16666685851 has 4 divisors (see below), whose sum is σ = 16667258392. Its totient is φ = 16666113312.

The previous prime is 16666685831. The next prime is 16666685873. The reversal of 16666685851 is 15858666661.

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 16666685851 - 2²⁷ = 16532468123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16666685821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240126 + ... + 301651.

It is an arithmetic number, because the mean of its divisors is an integer number (4166814598).

Almost surely, 2^16666685851 is an apocalyptic number.

16666685851 is a deficient number, since it is larger than the sum of its proper divisors (572541).

16666685851 is an equidigital number, since it uses as much as digits as its factorization.

16666685851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572540.

The product of its digits is 12441600, while the sum is 58.

The spelling of 16666685851 in words is "sixteen billion, six hundred sixty-six million, six hundred eighty-five thousand, eight hundred fifty-one".