6866938685 has 4 divisors (see below), whose sum is σ = 8240326428. Its totient is φ = 5493550944.

The previous prime is 6866938583. The next prime is 6866938699. The reversal of 6866938685 is 5868396686.

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 2631792601 + 4235146084 = 51301^2 + 65078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6866938685 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686693864 + ... + 686693873.

It is an arithmetic number, because the mean of its divisors is an integer number (2060081607).

Almost surely, 2^6866938685 is an apocalyptic number.

It is an amenable number.

6866938685 is a deficient number, since it is larger than the sum of its proper divisors (1373387743).

6866938685 is a wasteful number, since it uses less digits than its factorization.

6866938685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373387742.

The product of its digits is 89579520, while the sum is 65.

The square root of 6866938685 is about 82866.9939420998. The cubic root of 6866938685 is about 1900.7327446162.

The spelling of 6866938685 in words is "six billion, eight hundred sixty-six million, nine hundred thirty-eight thousand, six hundred eighty-five".