6799816521 has 9 divisors (see below), whose sum is σ = 9822314541. Its totient is φ = 4533046092.

The previous prime is 6799816469. The next prime is 6799816523. The reversal of 6799816521 is 1256189976.

The square root of 6799816521 is 82461.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 6799816521 - 2¹⁹ = 6799292233 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6799816523) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 233640 + ... + 261126.

Almost surely, 2^6799816521 is an apocalyptic number.

6799816521 is the 82461-st square number.

6799816521 is the 41231-st centered octagonal number.

It is an amenable number.

6799816521 is a deficient number, since it is larger than the sum of its proper divisors (3022498020).

6799816521 is an frugal number, since it uses more digits than its factorization.

6799816521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54980 (or 27490 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The cubic root of 6799816521 is about 1894.5194346275.

The spelling of 6799816521 in words is "six billion, seven hundred ninety-nine million, eight hundred sixteen thousand, five hundred twenty-one".