6516680820 has 96 divisors (see below), whose sum is σ = 19707746688. Its totient is φ = 1599416832.

The previous prime is 6516680809. The next prime is 6516680899. The reversal of 6516680820 is 280866156.

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, 258622 + ... + 282698.

It is an arithmetic number, because the mean of its divisors is an integer number (205289028).

Almost surely, 2^6516680820 is an apocalyptic number.

6516680820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6516680820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9853873344).

6516680820 is an abundant number, since it is smaller than the sum of its proper divisors (13191065868).

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

6516680820 is a wasteful number, since it uses less digits than its factorization.

6516680820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24449 (or 24447 counting only the distinct ones).

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

The square root of 6516680820 is about 80725.9612516321. The cubic root of 6516680820 is about 1867.8506594995.

The spelling of 6516680820 in words is "six billion, five hundred sixteen million, six hundred eighty thousand, eight hundred twenty".