6785645861 has 4 divisors (see below), whose sum is σ = 6785993292. Its totient is φ = 6785298432.

The previous prime is 6785645833. The next prime is 6785645903. The reversal of 6785645861 is 1685465876.

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 4687456225 + 2098189636 = 68465^2 + 45806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6785645861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6785645797 and 6785645806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6785645261) 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 3 ways as a sum of consecutive naturals, for example, 142556 + ... + 184101.

It is an arithmetic number, because the mean of its divisors is an integer number (1696498323).

Almost surely, 2^6785645861 is an apocalyptic number.

It is an amenable number.

6785645861 is a deficient number, since it is larger than the sum of its proper divisors (347431).

6785645861 is a wasteful number, since it uses less digits than its factorization.

6785645861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347430.

The product of its digits is 9676800, while the sum is 56.

The square root of 6785645861 is about 82375.0317814810. The cubic root of 6785645861 is about 1893.2024745039.

The spelling of 6785645861 in words is "six billion, seven hundred eighty-five million, six hundred forty-five thousand, eight hundred sixty-one".