6716321521 has 16 divisors (see below), whose sum is σ = 8268720768. Its totient is φ = 5312419200.

The previous prime is 6716321519. The next prime is 6716321527. The reversal of 6716321521 is 1251236176.

It is a cyclic number.

It is not a de Polignac number, because 6716321521 - 2¹ = 6716321519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6716321527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363261 + ... + 381301.

It is an arithmetic number, because the mean of its divisors is an integer number (516795048).

Almost surely, 2^6716321521 is an apocalyptic number.

It is an amenable number.

6716321521 is a deficient number, since it is larger than the sum of its proper divisors (1552399247).

6716321521 is a wasteful number, since it uses less digits than its factorization.

6716321521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22152.

The product of its digits is 15120, while the sum is 34.

The square root of 6716321521 is about 81953.1666319246. The cubic root of 6716321521 is about 1886.7332051093.

Adding to 6716321521 its reverse (1251236176), we get a palindrome (7967557697).

The spelling of 6716321521 in words is "six billion, seven hundred sixteen million, three hundred twenty-one thousand, five hundred twenty-one".