2065217905 has 4 divisors (see below), whose sum is σ = 2478261492. Its totient is φ = 1652174320.

The previous prime is 2065217897. The next prime is 2065217963. The reversal of 2065217905 is 5097125602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5097125602 = 2 ⋅2548562801.

It can be written as a sum of positive squares in 2 ways, for example, as 554885136 + 1510332769 = 23556^2 + 38863^2 .

It is not a de Polignac number, because 2065217905 - 2³ = 2065217897 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 206521786 + ... + 206521795.

It is an arithmetic number, because the mean of its divisors is an integer number (619565373).

Almost surely, 2^2065217905 is an apocalyptic number.

It is an amenable number.

2065217905 is a deficient number, since it is larger than the sum of its proper divisors (413043587).

2065217905 is an equidigital number, since it uses as much as digits as its factorization.

2065217905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413043586.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 2065217905 is about 45444.6686091999. The cubic root of 2065217905 is about 1273.4697324638.

The spelling of 2065217905 in words is "two billion, sixty-five million, two hundred seventeen thousand, nine hundred five".