6678812785 has 4 divisors (see below), whose sum is σ = 8014575348. Its totient is φ = 5343050224.

The previous prime is 6678812783. The next prime is 6678812827. The reversal of 6678812785 is 5872188766.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1429520481 + 5249292304 = 37809^2 + 72452^2 .

It is a cyclic number.

It is not a de Polignac number, because 6678812785 - 2¹ = 6678812783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6678812783) 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, 667881274 + ... + 667881283.

It is an arithmetic number, because the mean of its divisors is an integer number (2003643837).

Almost surely, 2^6678812785 is an apocalyptic number.

It is an amenable number.

6678812785 is a deficient number, since it is larger than the sum of its proper divisors (1335762563).

6678812785 is a wasteful number, since it uses less digits than its factorization.

6678812785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335762562.

The product of its digits is 9031680, while the sum is 58.

The square root of 6678812785 is about 81724.0037259556. The cubic root of 6678812785 is about 1883.2143578134.

The spelling of 6678812785 in words is "six billion, six hundred seventy-eight million, eight hundred twelve thousand, seven hundred eighty-five".