16544043409 has 4 divisors (see below), whose sum is σ = 16753461760. Its totient is φ = 16334625060.

The previous prime is 16544043401. The next prime is 16544043419. The reversal of 16544043409 is 90434044561.

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 16544043409 - 2³ = 16544043401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16544043401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104709057 + ... + 104709214.

It is an arithmetic number, because the mean of its divisors is an integer number (4188365440).

Almost surely, 2^16544043409 is an apocalyptic number.

It is an amenable number.

16544043409 is a deficient number, since it is larger than the sum of its proper divisors (209418351).

16544043409 is an equidigital number, since it uses as much as digits as its factorization.

16544043409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209418350.

The product of its (nonzero) digits is 207360, while the sum is 40.

It can be divided in two parts, 165440 and 43409, that added together give a square (208849 = 457²).

The spelling of 16544043409 in words is "sixteen billion, five hundred forty-four million, forty-three thousand, four hundred nine".