6681335785 has 8 divisors (see below), whose sum is σ = 8050872456. Its totient is φ = 5322888960.

The previous prime is 6681335777. The next prime is 6681335819. The reversal of 6681335785 is 5875331866.

It can be written as a sum of positive squares in 4 ways, for example, as 1037870656 + 5643465129 = 32216^2 + 75123^2 .

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

It is not a de Polignac number, because 6681335785 - 2³ = 6681335777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2771134 + ... + 2773543.

It is an arithmetic number, because the mean of its divisors is an integer number (1006359057).

Almost surely, 2^6681335785 is an apocalyptic number.

It is an amenable number.

6681335785 is a deficient number, since it is larger than the sum of its proper divisors (1369536671).

6681335785 is a wasteful number, since it uses less digits than its factorization.

6681335785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5544923.

The product of its digits is 3628800, while the sum is 52.

The square root of 6681335785 is about 81739.4383697368. The cubic root of 6681335785 is about 1883.4514634093.

The spelling of 6681335785 in words is "six billion, six hundred eighty-one million, three hundred thirty-five thousand, seven hundred eighty-five".