16565076256081 has 4 divisors (see below), whose sum is σ = 16571929827492. Its totient is φ = 16558222684672.

The previous prime is 16565076256063. The next prime is 16565076256093. The reversal of 16565076256081 is 18065267056561.

It is a happy number.

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 16245897584400 + 319178671681 = 4030620^2 + 564959^2 .

It is a cyclic number.

It is not a de Polignac number, because 16565076256081 - 2⁹ = 16565076255569 is a prime.

It is a super-2 number, since 2×16565076256081² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16565076256021) by changing a digit.

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, 3426782080 + ... + 3426786913.

It is an arithmetic number, because the mean of its divisors is an integer number (4142982456873).

Almost surely, 2^{16565076256081} is an apocalyptic number.

It is an amenable number.

16565076256081 is a deficient number, since it is larger than the sum of its proper divisors (6853571411).

16565076256081 is an equidigital number, since it uses as much as digits as its factorization.

16565076256081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6853571410.

The product of its (nonzero) digits is 18144000, while the sum is 58.

The spelling of 16565076256081 in words is "sixteen trillion, five hundred sixty-five billion, seventy-six million, two hundred fifty-six thousand, eighty-one".