2065620565 has 4 divisors (see below), whose sum is σ = 2478744684. Its totient is φ = 1652496448.

The previous prime is 2065620527. The next prime is 2065620619. The reversal of 2065620565 is 5650265602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5650265602 = 2 ⋅2825132801.

It can be written as a sum of positive squares in 2 ways, for example, as 409293361 + 1656327204 = 20231^2 + 40698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2065620565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206562052 + ... + 206562061.

It is an arithmetic number, because the mean of its divisors is an integer number (619686171).

Almost surely, 2^2065620565 is an apocalyptic number.

It is an amenable number.

2065620565 is a deficient number, since it is larger than the sum of its proper divisors (413124119).

2065620565 is an equidigital number, since it uses as much as digits as its factorization.

2065620565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413124118.

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 2065620565 is about 45449.0986159242. The cubic root of 2065620565 is about 1273.5524908012.

The spelling of 2065620565 in words is "two billion, sixty-five million, six hundred twenty thousand, five hundred sixty-five".