2665260665 has 4 divisors (see below), whose sum is σ = 3198312804. Its totient is φ = 2132208528.

The previous prime is 2665260659. The next prime is 2665260679. The reversal of 2665260665 is 5660625662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 604373056 + 2060887609 = 24584^2 + 45397^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665260665 - 2⁴ = 2665260649 is a prime.

It is a super-2 number, since 2×2665260665² = 14207228824792484450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 266526062 + ... + 266526071.

It is an arithmetic number, because the mean of its divisors is an integer number (799578201).

Almost surely, 2^2665260665 is an apocalyptic number.

It is an amenable number.

2665260665 is a deficient number, since it is larger than the sum of its proper divisors (533052139).

2665260665 is an equidigital number, since it uses as much as digits as its factorization.

2665260665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533052138.

The product of its (nonzero) digits is 777600, while the sum is 44.

The square root of 2665260665 is about 51626.1626019211. The cubic root of 2665260665 is about 1386.4787890786.

The spelling of 2665260665 in words is "two billion, six hundred sixty-five million, two hundred sixty thousand, six hundred sixty-five".