6501680688 has 80 divisors (see below), whose sum is σ = 17098905600. Its totient is φ = 2128473600.

The previous prime is 6501680671. The next prime is 6501680693. The reversal of 6501680688 is 8860861056.

It is a happy number.

It is a Cunningham number, because it is equal to 80633²-1.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640033 + ... + 650111.

It is an arithmetic number, because the mean of its divisors is an integer number (213736320).

Almost surely, 2^6501680688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6501680688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8549452800).

6501680688 is an abundant number, since it is smaller than the sum of its proper divisors (10597224912).

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

6501680688 is a wasteful number, since it uses less digits than its factorization.

6501680688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10330 (or 10324 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The square root of 6501680688 is about 80632.9999937991. Note that the first 5 decimals coincide. The cubic root of 6501680688 is about 1866.4164154883.

The spelling of 6501680688 in words is "six billion, five hundred one million, six hundred eighty thousand, six hundred eighty-eight".