6680440777 has 8 divisors (see below), whose sum is σ = 6732016200. Its totient is φ = 6628955520.

The previous prime is 6680440769. The next prime is 6680440807. The reversal of 6680440777 is 7770440866.

It can be written as a sum of positive squares in 4 ways, for example, as 819619641 + 5860821136 = 28629^2 + 76556^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6680440777 - 2³ = 6680440769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6680440777.

It is not an unprimeable number, because it can be changed into a prime (6680440747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130173 + ... + 174085.

It is an arithmetic number, because the mean of its divisors is an integer number (841502025).

Almost surely, 2^6680440777 is an apocalyptic number.

It is an amenable number.

6680440777 is a deficient number, since it is larger than the sum of its proper divisors (51575423).

6680440777 is a wasteful number, since it uses less digits than its factorization.

6680440777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45083.

The product of its (nonzero) digits is 1580544, while the sum is 49.

The square root of 6680440777 is about 81733.9634240259. The cubic root of 6680440777 is about 1883.3673594987.

The spelling of 6680440777 in words is "six billion, six hundred eighty million, four hundred forty thousand, seven hundred seventy-seven".