16565028481 has 4 divisors (see below), whose sum is σ = 16604375764. Its totient is φ = 16525681200.

The previous prime is 16565028461. The next prime is 16565028509. The reversal of 16565028481 is 18482056561.

16565028481 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.

It can be written as a sum of positive squares in 2 ways, for example, as 2526570225 + 14038458256 = 50265^2 + 118484^2 .

It is a cyclic number.

It is not a de Polignac number, because 16565028481 - 2¹³ = 16565020289 is a prime.

It is a super-2 number, since 2×16565028481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16565028401) 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, 19673010 + ... + 19673851.

It is an arithmetic number, because the mean of its divisors is an integer number (4151093941).

Almost surely, 2^16565028481 is an apocalyptic number.

It is an amenable number.

16565028481 is a deficient number, since it is larger than the sum of its proper divisors (39347283).

16565028481 is an equidigital number, since it uses as much as digits as its factorization.

16565028481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39347282.

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 16565028481 in words is "sixteen billion, five hundred sixty-five million, twenty-eight thousand, four hundred eighty-one".