2765807665 has 8 divisors (see below), whose sum is σ = 3322080360. Its totient is φ = 2210572032.

The previous prime is 2765807647. The next prime is 2765807729. The reversal of 2765807665 is 5667085672.

It can be written as a sum of positive squares in 4 ways, for example, as 10817521 + 2754990144 = 3289^2 + 52488^2 .

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 2765807665 - 2⁹ = 2765807153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253384 + ... + 264073.

It is an arithmetic number, because the mean of its divisors is an integer number (415260045).

Almost surely, 2^2765807665 is an apocalyptic number.

It is an amenable number.

2765807665 is a deficient number, since it is larger than the sum of its proper divisors (556272695).

2765807665 is a wasteful number, since it uses less digits than its factorization.

2765807665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518531.

The product of its (nonzero) digits is 4233600, while the sum is 52.

The square root of 2765807665 is about 52590.9466068068. The cubic root of 2765807665 is about 1403.6990046461.

The spelling of 2765807665 in words is "two billion, seven hundred sixty-five million, eight hundred seven thousand, six hundred sixty-five".