6501680689 has 9 divisors (see below), whose sum is σ = 7563836217. Its totient is φ = 5572385364.

The previous prime is 6501680671. The next prime is 6501680693. The reversal of 6501680689 is 9860861056.

The square root of 6501680689 is 80633.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 6501680689 - 2⁹ = 6501680177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (6501680609) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 558672 + ... + 570190.

Almost surely, 2^6501680689 is an apocalyptic number.

6501680689 is the 80633-rd square number.

6501680689 is the 40317-th centered octagonal number.

It is an amenable number.

6501680689 is a deficient number, since it is larger than the sum of its proper divisors (1062155528).

6501680689 is an frugal number, since it uses more digits than its factorization.

6501680689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23052 (or 11526 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The cubic root of 6501680689 is about 1866.4164155840.

Multiplying 6501680689 by its sum of digits (49), we get a square (318582353761 = 564431²).

6501680689 divided by its sum of digits (49) gives a square (132687361 = 11519²).

The spelling of 6501680689 in words is "six billion, five hundred one million, six hundred eighty thousand, six hundred eighty-nine".