2665765805 has 8 divisors (see below), whose sum is σ = 3199218552. Its totient is φ = 2132412928.

The previous prime is 2665765741. The next prime is 2665765807. The reversal of 2665765805 is 5085675662.

It can be written as a sum of positive squares in 4 ways, for example, as 317588041 + 2348177764 = 17821^2 + 48458^2 .

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 2665765805 - 2⁶ = 2665765741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665765807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60137 + ... + 94593.

It is an arithmetic number, because the mean of its divisors is an integer number (399902319).

Almost surely, 2^2665765805 is an apocalyptic number.

It is an amenable number.

2665765805 is a deficient number, since it is larger than the sum of its proper divisors (533452747).

2665765805 is a wasteful number, since it uses less digits than its factorization.

2665765805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49935.

The product of its (nonzero) digits is 3024000, while the sum is 50.

The square root of 2665765805 is about 51631.0546570569. The cubic root of 2665765805 is about 1386.5663754653.

The spelling of 2665765805 in words is "two billion, six hundred sixty-five million, seven hundred sixty-five thousand, eight hundred five".