16505656513 has 4 divisors (see below), whose sum is σ = 16776241108. Its totient is φ = 16235071920.

The previous prime is 16505656499. The next prime is 16505656529. The reversal of 16505656513 is 31565650561.

It is a happy number.

16505656513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31565650561 = 29 ⋅1088470709.

It can be written as a sum of positive squares in 2 ways, for example, as 794788864 + 15710867649 = 28192^2 + 125343^2 .

It is not a de Polignac number, because 16505656513 - 2¹⁷ = 16505525441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16505656513.

It is not an unprimeable number, because it can be changed into a prime (16505653513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135292206 + ... + 135292327.

It is an arithmetic number, because the mean of its divisors is an integer number (4194060277).

Almost surely, 2^16505656513 is an apocalyptic number.

It is an amenable number.

16505656513 is a deficient number, since it is larger than the sum of its proper divisors (270584595).

16505656513 is an equidigital number, since it uses as much as digits as its factorization.

16505656513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270584594.

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 16505656513 in words is "sixteen billion, five hundred five million, six hundred fifty-six thousand, five hundred thirteen".