16206005505505 has 4 divisors (see below), whose sum is σ = 19447206606612. Its totient is φ = 12964804404400.

The previous prime is 16206005505463. The next prime is 16206005505577. The reversal of 16206005505505 is 50550550060261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7505369805649 + 8700635699856 = 2739593^2 + 2949684^2 .

It is not a de Polignac number, because 16206005505505 - 2⁷ = 16206005505377 is a prime.

It is a super-2 number, since 2×16206005505505² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620600550546 + ... + 1620600550555.

It is an arithmetic number, because the mean of its divisors is an integer number (4861801651653).

Almost surely, 2^{16206005505505} is an apocalyptic number.

It is an amenable number.

16206005505505 is a deficient number, since it is larger than the sum of its proper divisors (3241201101107).

16206005505505 is an equidigital number, since it uses as much as digits as its factorization.

16206005505505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241201101106.

The product of its (nonzero) digits is 225000, while the sum is 40.

Adding to 16206005505505 its reverse (50550550060261), we get a palindrome (66756555565766).

The spelling of 16206005505505 in words is "sixteen trillion, two hundred six billion, five million, five hundred five thousand, five hundred five".