16520216005 has 4 divisors (see below), whose sum is σ = 19824259212. Its totient is φ = 13216172800.

The previous prime is 16520215991. The next prime is 16520216033. The reversal of 16520216005 is 50061202561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50061202561 = 50833 ⋅984817.

It can be written as a sum of positive squares in 2 ways, for example, as 11782234116 + 4737981889 = 108546^2 + 68833^2 .

It is not a de Polignac number, because 16520216005 - 2¹³ = 16520207813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1652021596 + ... + 1652021605.

It is an arithmetic number, because the mean of its divisors is an integer number (4956064803).

Almost surely, 2^16520216005 is an apocalyptic number.

It is an amenable number.

16520216005 is a deficient number, since it is larger than the sum of its proper divisors (3304043207).

16520216005 is an equidigital number, since it uses as much as digits as its factorization.

16520216005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304043206.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 16520216005 its reverse (50061202561), we get a palindrome (66581418566).

The spelling of 16520216005 in words is "sixteen billion, five hundred twenty million, two hundred sixteen thousand, five".