6686789489 has 2 divisors, whose sum is σ = 6686789490. Its totient is φ = 6686789488.

The previous prime is 6686789477. The next prime is 6686789509. The reversal of 6686789489 is 9849876866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6226472464 + 460317025 = 78908^2 + 21455^2 .

It is a cyclic number.

It is not a de Polignac number, because 6686789489 - 2²⁰ = 6685740913 is a prime.

It is a super-4 number, since 4×6686789489⁴ (a number of 40 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (6686789419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343394744 + 3343394745.

It is an arithmetic number, because the mean of its divisors is an integer number (3343394745).

Almost surely, 2^6686789489 is an apocalyptic number.

It is an amenable number.

6686789489 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686789489 is an equidigital number, since it uses as much as digits as its factorization.

6686789489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 250822656, while the sum is 71.

The square root of 6686789489 is about 81772.7918625749. The cubic root of 6686789489 is about 1883.9637857733.

The spelling of 6686789489 in words is "six billion, six hundred eighty-six million, seven hundred eighty-nine thousand, four hundred eighty-nine".