6686918055 has 24 divisors (see below), whose sum is σ = 11903921952. Its totient is φ = 3469967424.

The previous prime is 6686918053. The next prime is 6686918059. The reversal of 6686918055 is 5508196866.

It is a happy number.

It is not a de Polignac number, because 6686918055 - 2¹ = 6686918053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6686917992 and 6686918010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686918053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2006419 + ... + 2009748.

It is an arithmetic number, because the mean of its divisors is an integer number (495996748).

Almost surely, 2^6686918055 is an apocalyptic number.

6686918055 is a deficient number, since it is larger than the sum of its proper divisors (5217003897).

6686918055 is a wasteful number, since it uses less digits than its factorization.

6686918055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016215 (or 4016212 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The square root of 6686918055 is about 81773.5779760186. The cubic root of 6686918055 is about 1883.9758599352.

The spelling of 6686918055 in words is "six billion, six hundred eighty-six million, nine hundred eighteen thousand, fifty-five".