2605276565 has 8 divisors (see below), whose sum is σ = 3133554648. Its totient is φ = 2079406080.

The previous prime is 2605276559. The next prime is 2605276573. The reversal of 2605276565 is 5656725062.

It can be written as a sum of positive squares in 4 ways, for example, as 81018001 + 2524258564 = 9001^2 + 50242^2 .

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

It is not a de Polignac number, because 2605276565 - 2⁶ = 2605276501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599516 + ... + 603845.

It is an arithmetic number, because the mean of its divisors is an integer number (391694331).

Almost surely, 2^2605276565 is an apocalyptic number.

It is an amenable number.

2605276565 is a deficient number, since it is larger than the sum of its proper divisors (528278083).

2605276565 is a wasteful number, since it uses less digits than its factorization.

2605276565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203799.

The product of its (nonzero) digits is 756000, while the sum is 44.

The square root of 2605276565 is about 51041.9098878559. The cubic root of 2605276565 is about 1375.9984488008.

The spelling of 2605276565 in words is "two billion, six hundred five million, two hundred seventy-six thousand, five hundred sixty-five".