6680818587013 has 4 divisors (see below), whose sum is σ = 6680825998540. Its totient is φ = 6680811175488.

The previous prime is 6680818586989. The next prime is 6680818587017. The reversal of 6680818587013 is 3107858180866.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4563380346849 + 2117438240164 = 2136207^2 + 1455142^2 .

It is a cyclic number.

It is not a de Polignac number, because 6680818587013 - 2⁹ = 6680818586501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6680818587017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2130420 + ... + 4230877.

It is an arithmetic number, because the mean of its divisors is an integer number (1670206499635).

Almost surely, 2^{6680818587013} is an apocalyptic number.

It is an amenable number.

6680818587013 is a deficient number, since it is larger than the sum of its proper divisors (7411527).

6680818587013 is a wasteful number, since it uses less digits than its factorization.

6680818587013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7411526.

The product of its (nonzero) digits is 15482880, while the sum is 61.

The spelling of 6680818587013 in words is "six trillion, six hundred eighty billion, eight hundred eighteen million, five hundred eighty-seven thousand, thirteen".