6686880247 has 4 divisors (see below), whose sum is σ = 6698885976. Its totient is φ = 6674874520.

The previous prime is 6686880157. The next prime is 6686880253. The reversal of 6686880247 is 7420886866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7420886866 = 2 ⋅3710443433.

It is a cyclic number.

It is not a de Polignac number, because 6686880247 - 2¹⁹ = 6686355959 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 (6686880847) 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, 6002029 + ... + 6003142.

It is an arithmetic number, because the mean of its divisors is an integer number (1674721494).

Almost surely, 2^6686880247 is an apocalyptic number.

6686880247 is a deficient number, since it is larger than the sum of its proper divisors (12005729).

6686880247 is a wasteful number, since it uses less digits than its factorization.

6686880247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12005728.

The product of its (nonzero) digits is 6193152, while the sum is 55.

The square root of 6686880247 is about 81773.3468007761. The cubic root of 6686880247 is about 1883.9723092465.

The spelling of 6686880247 in words is "six billion, six hundred eighty-six million, eight hundred eighty thousand, two hundred forty-seven".