6816821152 has 24 divisors (see below), whose sum is σ = 13436403876. Its totient is φ = 3404401152.

The previous prime is 6816821149. The next prime is 6816821173. The reversal of 6816821152 is 2511286186.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6816814096 + 7056 = 82564^2 + 84^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97573 + ... + 152164.

Almost surely, 2^6816821152 is an apocalyptic number.

It is an amenable number.

6816821152 is a deficient number, since it is larger than the sum of its proper divisors (6619582724).

6816821152 is a wasteful number, since it uses less digits than its factorization.

6816821152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250600 (or 250592 counting only the distinct ones).

The product of its digits is 46080, while the sum is 40.

The square root of 6816821152 is about 82564.0427304768. The cubic root of 6816821152 is about 1896.0973589083.

The spelling of 6816821152 in words is "six billion, eight hundred sixteen million, eight hundred twenty-one thousand, one hundred fifty-two".