6993216678 has 64 divisors (see below), whose sum is σ = 16388444160. Its totient is φ = 1947752352.

The previous prime is 6993216653. The next prime is 6993216689. The reversal of 6993216678 is 8766123996.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 984343 + ... + 991421.

It is an arithmetic number, because the mean of its divisors is an integer number (256069440).

Almost surely, 2^6993216678 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6993216678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8194222080).

6993216678 is an abundant number, since it is smaller than the sum of its proper divisors (9395227482).

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

6993216678 is a wasteful number, since it uses less digits than its factorization.

6993216678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7681.

The product of its digits is 5878656, while the sum is 57.

The square root of 6993216678 is about 83625.4547252211. The cubic root of 6993216678 is about 1912.3130769681.

The spelling of 6993216678 in words is "six billion, nine hundred ninety-three million, two hundred sixteen thousand, six hundred seventy-eight".