16564081441 has 4 divisors (see below), whose sum is σ = 16564942000. Its totient is φ = 16563220884.

The previous prime is 16564081439. The next prime is 16564081451. The reversal of 16564081441 is 14418046561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16564081441 - 2¹ = 16564081439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16564081394 and 16564081403.

It is not an unprimeable number, because it can be changed into a prime (16564081451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400731 + ... + 440128.

It is an arithmetic number, because the mean of its divisors is an integer number (4141235500).

Almost surely, 2^16564081441 is an apocalyptic number.

It is an amenable number.

16564081441 is a deficient number, since it is larger than the sum of its proper divisors (860559).

16564081441 is an equidigital number, since it uses as much as digits as its factorization.

16564081441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860558.

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 16564081441 in words is "sixteen billion, five hundred sixty-four million, eighty-one thousand, four hundred forty-one".