6681523218 has 16 divisors (see below), whose sum is σ = 13368415296. Its totient is φ = 2226279600.

The previous prime is 6681523201. The next prime is 6681523229. The reversal of 6681523218 is 8123251866.

It is a self number, because there is not a number n which added to its sum of digits gives 6681523218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207433 + ... + 237468.

It is an arithmetic number, because the mean of its divisors is an integer number (835525956).

Almost surely, 2^6681523218 is an apocalyptic number.

6681523218 is an abundant number, since it is smaller than the sum of its proper divisors (6686892078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6681523218 is a wasteful number, since it uses less digits than its factorization.

6681523218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447409.

The product of its digits is 138240, while the sum is 42.

The square root of 6681523218 is about 81740.5848890256. The cubic root of 6681523218 is about 1883.4690755390.

The spelling of 6681523218 in words is "six billion, six hundred eighty-one million, five hundred twenty-three thousand, two hundred eighteen".