680665777 has 12 divisors (see below), whose sum is σ = 749771008. Its totient is φ = 617463000.

The previous prime is 680665751. The next prime is 680665787. The reversal of 680665777 is 777566086.

It is a de Polignac number, because none of the positive numbers 2^k-680665777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680665787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53152 + ... + 64702.

Almost surely, 2^680665777 is an apocalyptic number.

It is an amenable number.

680665777 is a deficient number, since it is larger than the sum of its proper divisors (69105231).

680665777 is a wasteful number, since it uses less digits than its factorization.

680665777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12060 (or 12049 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 52.

The square root of 680665777 is about 26089.5721889034. The cubic root of 680665777 is about 879.6528318069.

The spelling of 680665777 in words is "six hundred eighty million, six hundred sixty-five thousand, seven hundred seventy-seven".