6686306121 has 16 divisors (see below), whose sum is σ = 9744228288. Its totient is φ = 4044518400.

The previous prime is 6686306119. The next prime is 6686306141. The reversal of 6686306121 is 1216036866.

It is not a de Polignac number, because 6686306121 - 2¹ = 6686306119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6686306121.

It is not an unprimeable number, because it can be changed into a prime (6686306141) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 177256 + ... + 211641.

It is an arithmetic number, because the mean of its divisors is an integer number (609014268).

Almost surely, 2^6686306121 is an apocalyptic number.

It is an amenable number.

6686306121 is a deficient number, since it is larger than the sum of its proper divisors (3057922167).

6686306121 is a wasteful number, since it uses less digits than its factorization.

6686306121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389432.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 6686306121 is about 81769.8362539635. The cubic root of 6686306121 is about 1883.9183893115.

The spelling of 6686306121 in words is "six billion, six hundred eighty-six million, three hundred six thousand, one hundred twenty-one".