6686861807 has 4 divisors (see below), whose sum is σ = 6716319576. Its totient is φ = 6657404040.

The previous prime is 6686861761. The next prime is 6686861813. The reversal of 6686861807 is 7081686866.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6686861807 - 2¹⁴ = 6686845423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686861827) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 14728544 + ... + 14728997.

It is an arithmetic number, because the mean of its divisors is an integer number (1679079894).

Almost surely, 2^6686861807 is an apocalyptic number.

6686861807 is a deficient number, since it is larger than the sum of its proper divisors (29457769).

6686861807 is a wasteful number, since it uses less digits than its factorization.

6686861807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29457768.

The product of its (nonzero) digits is 4644864, while the sum is 56.

The square root of 6686861807 is about 81773.2340500240. The cubic root of 6686861807 is about 1883.9705774732.

The spelling of 6686861807 in words is "six billion, six hundred eighty-six million, eight hundred sixty-one thousand, eight hundred seven".