6501680687 has 16 divisors (see below), whose sum is σ = 6885765120. Its totient is φ = 6126259392.

The previous prime is 6501680671. The next prime is 6501680693. The reversal of 6501680687 is 7860861056.

It is not a de Polignac number, because 6501680687 - 2⁴ = 6501680671 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6501680587) 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, 1742618 + ... + 1746344.

It is an arithmetic number, because the mean of its divisors is an integer number (430360320).

Almost surely, 2^6501680687 is an apocalyptic number.

6501680687 is a deficient number, since it is larger than the sum of its proper divisors (384084433).

6501680687 is a wasteful number, since it uses less digits than its factorization.

6501680687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4862.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 6501680687 is about 80632.9999875981. Note that the first 4 decimals coincide. The cubic root of 6501680687 is about 1866.4164153926.

The spelling of 6501680687 in words is "six billion, five hundred one million, six hundred eighty thousand, six hundred eighty-seven".