6688448867 has 4 divisors (see below), whose sum is σ = 6694481040. Its totient is φ = 6682416696.

The previous prime is 6688448863. The next prime is 6688448903. The reversal of 6688448867 is 7688448866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6688448867 - 2² = 6688448863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6688448861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3014423 + ... + 3016640.

It is an arithmetic number, because the mean of its divisors is an integer number (1673620260).

Almost surely, 2^6688448867 is an apocalyptic number.

6688448867 is a deficient number, since it is larger than the sum of its proper divisors (6032173).

6688448867 is a wasteful number, since it uses less digits than its factorization.

6688448867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6032172.

The product of its digits is 99090432, while the sum is 65.

The square root of 6688448867 is about 81782.9375053256. The cubic root of 6688448867 is about 1884.1196128960.

Subtracting 6688448867 from its reverse (7688448866), we obtain a palindrome (999999999).

The spelling of 6688448867 in words is "six billion, six hundred eighty-eight million, four hundred forty-eight thousand, eight hundred sixty-seven".