6689643385 has 16 divisors (see below), whose sum is σ = 8164031040. Its totient is φ = 5260847040.

The previous prime is 6689643383. The next prime is 6689643397. The reversal of 6689643385 is 5833469866.

It is a happy number.

It is not a de Polignac number, because 6689643385 - 2¹ = 6689643383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6689643383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598054 + ... + 609136.

It is an arithmetic number, because the mean of its divisors is an integer number (510251940).

Almost surely, 2^6689643385 is an apocalyptic number.

It is an amenable number.

6689643385 is a deficient number, since it is larger than the sum of its proper divisors (1474387655).

6689643385 is a wasteful number, since it uses less digits than its factorization.

6689643385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13128.

The product of its digits is 22394880, while the sum is 58.

The square root of 6689643385 is about 81790.2401573684. The cubic root of 6689643385 is about 1884.2317704813.

The spelling of 6689643385 in words is "six billion, six hundred eighty-nine million, six hundred forty-three thousand, three hundred eighty-five".