1806388816285 has 16 divisors (see below), whose sum is σ = 2189740100400. Its totient is φ = 1430403366400.

The previous prime is 1806388816279. The next prime is 1806388816289. The reversal of 1806388816285 is 5826188836081.

It can be written as a sum of positive squares in 8 ways, for example, as 63128070009 + 1743260746276 = 251253^2 + 1320326^2 .

It is not a de Polignac number, because 1806388816285 - 2²¹ = 1806386719133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1806388816289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1316691 + ... + 2312239.

It is an arithmetic number, because the mean of its divisors is an integer number (136858756275).

Almost surely, 2^{1806388816285} is an apocalyptic number.

It is an amenable number.

1806388816285 is a deficient number, since it is larger than the sum of its proper divisors (383351284115).

1806388816285 is a wasteful number, since it uses less digits than its factorization.

1806388816285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999248.

The product of its (nonzero) digits is 35389440, while the sum is 64.

The spelling of 1806388816285 in words is "one trillion, eight hundred six billion, three hundred eighty-eight million, eight hundred sixteen thousand, two hundred eighty-five".