16611412205 has 4 divisors (see below), whose sum is σ = 19933694652. Its totient is φ = 13289129760.

The previous prime is 16611412189. The next prime is 16611412247. The reversal of 16611412205 is 50221411661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50221411661 = 2857 ⋅17578373.

It can be written as a sum of positive squares in 2 ways, for example, as 8002912681 + 8608499524 = 89459^2 + 92782^2 .

It is not a de Polignac number, because 16611412205 - 2⁴ = 16611412189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1661141216 + ... + 1661141225.

It is an arithmetic number, because the mean of its divisors is an integer number (4983423663).

Almost surely, 2^16611412205 is an apocalyptic number.

It is an amenable number.

16611412205 is a deficient number, since it is larger than the sum of its proper divisors (3322282447).

16611412205 is an equidigital number, since it uses as much as digits as its factorization.

16611412205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322282446.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 16611412205 its reverse (50221411661), we get a palindrome (66832823866).

The spelling of 16611412205 in words is "sixteen billion, six hundred eleven million, four hundred twelve thousand, two hundred five".