6866556685 has 8 divisors (see below), whose sum is σ = 8241323256. Its totient is φ = 5492275200.

The previous prime is 6866556659. The next prime is 6866556691. The reversal of 6866556685 is 5866556686.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2318807716 + 4547748969 = 48154^2 + 67437^2 .

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

It is not a de Polignac number, because 6866556685 - 2²⁹ = 6329685773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 89364 + ... + 147373.

It is an arithmetic number, because the mean of its divisors is an integer number (1030165407).

Almost surely, 2^6866556685 is an apocalyptic number.

It is an amenable number.

6866556685 is a deficient number, since it is larger than the sum of its proper divisors (1374766571).

6866556685 is a wasteful number, since it uses less digits than its factorization.

6866556685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242543.

The product of its digits is 62208000, while the sum is 61.

The square root of 6866556685 is about 82864.6890116653. The cubic root of 6866556685 is about 1900.6974987613.

Subtracting from 6866556685 its reverse (5866556686), we obtain a palindrome (999999999).

The spelling of 6866556685 in words is "six billion, eight hundred sixty-six million, five hundred fifty-six thousand, six hundred eighty-five".