16805668859 has 4 divisors (see below), whose sum is σ = 19206478704. Its totient is φ = 14404859016.

The previous prime is 16805668849. The next prime is 16805668877. The reversal of 16805668859 is 95886650861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95886650861 = 1747 ⋅54886463.

It is a cyclic number.

It is not a de Polignac number, because 16805668859 - 2⁴ = 16805668843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16805668849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200404912 + ... + 1200404925.

It is an arithmetic number, because the mean of its divisors is an integer number (4801619676).

Almost surely, 2^16805668859 is an apocalyptic number.

16805668859 is a deficient number, since it is larger than the sum of its proper divisors (2400809845).

16805668859 is an equidigital number, since it uses as much as digits as its factorization.

16805668859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400809844.

The product of its (nonzero) digits is 24883200, while the sum is 62.

The spelling of 16805668859 in words is "sixteen billion, eight hundred five million, six hundred sixty-eight thousand, eight hundred fifty-nine".