16256266561 has 4 divisors (see below), whose sum is σ = 16278445012. Its totient is φ = 16234088112.

The previous prime is 16256266547. The next prime is 16256266589. The reversal of 16256266561 is 16566265261.

16256266561 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 7671132225 + 8585134336 = 87585^2 + 92656^2 .

It is a cyclic number.

It is not a de Polignac number, because 16256266561 - 2¹⁵ = 16256233793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16256266501) 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, 11088126 + ... + 11089591.

It is an arithmetic number, because the mean of its divisors is an integer number (4069611253).

Almost surely, 2^16256266561 is an apocalyptic number.

It is an amenable number.

16256266561 is a deficient number, since it is larger than the sum of its proper divisors (22178451).

16256266561 is an equidigital number, since it uses as much as digits as its factorization.

16256266561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22178450.

The product of its digits is 777600, while the sum is 46.

The spelling of 16256266561 in words is "sixteen billion, two hundred fifty-six million, two hundred sixty-six thousand, five hundred sixty-one".