16606642205 has 4 divisors (see below), whose sum is σ = 19927970652. Its totient is φ = 13285313760.

The previous prime is 16606642159. The next prime is 16606642207. The reversal of 16606642205 is 50224660661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50224660661 = 7 ⋅7174951523.

It can be written as a sum of positive squares in 2 ways, for example, as 6033250276 + 10573391929 = 77674^2 + 102827^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16606642205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16606642207) 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, 1660664216 + ... + 1660664225.

It is an arithmetic number, because the mean of its divisors is an integer number (4981992663).

Almost surely, 2^16606642205 is an apocalyptic number.

It is an amenable number.

16606642205 is a deficient number, since it is larger than the sum of its proper divisors (3321328447).

16606642205 is an equidigital number, since it uses as much as digits as its factorization.

16606642205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321328446.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 16606642205 in words is "sixteen billion, six hundred six million, six hundred forty-two thousand, two hundred five".