16278856805 has 8 divisors (see below), whose sum is σ = 19854868344. Its totient is φ = 12809592000.

The previous prime is 16278856799. The next prime is 16278856807. The reversal of 16278856805 is 50865887261.

It is a happy number.

16278856805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1144198276 + 15134658529 = 33826^2 + 123023^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16278856805 - 2²⁰ = 16277808229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16278856807) 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 7 ways as a sum of consecutive naturals, for example, 26686346 + ... + 26686955.

It is an arithmetic number, because the mean of its divisors is an integer number (2481858543).

Almost surely, 2^16278856805 is an apocalyptic number.

It is an amenable number.

16278856805 is a deficient number, since it is larger than the sum of its proper divisors (3576011539).

16278856805 is an equidigital number, since it uses as much as digits as its factorization.

16278856805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53373367.

The product of its (nonzero) digits is 6451200, while the sum is 56.

The spelling of 16278856805 in words is "sixteen billion, two hundred seventy-eight million, eight hundred fifty-six thousand, eight hundred five".