1285320808799 has 4 divisors (see below), whose sum is σ = 1352969272440. Its totient is φ = 1217672345160.

The previous prime is 1285320808747. The next prime is 1285320808819. The reversal of 1285320808799 is 9978080235821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285320808799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285320808099) 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, 33824231792 + ... + 33824231829.

It is an arithmetic number, because the mean of its divisors is an integer number (338242318110).

Almost surely, 2^{1285320808799} is an apocalyptic number.

1285320808799 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1285320808799 is a deficient number, since it is larger than the sum of its proper divisors (67648463641).

1285320808799 is an equidigital number, since it uses as much as digits as its factorization.

1285320808799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67648463640.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 1285320808799 in words is "one trillion, two hundred eighty-five billion, three hundred twenty million, eight hundred eight thousand, seven hundred ninety-nine".