4065340561 has 4 divisors (see below), whose sum is σ = 4070245300. Its totient is φ = 4060435824.

The previous prime is 4065340549. The next prime is 4065340637. The reversal of 4065340561 is 1650435604.

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 1364563600 + 2700776961 = 36940^2 + 51969^2 .

It is a cyclic number.

It is not a de Polignac number, because 4065340561 - 2²⁹ = 3528469649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4065340501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2451126 + ... + 2452783.

It is an arithmetic number, because the mean of its divisors is an integer number (1017561325).

Almost surely, 2^4065340561 is an apocalyptic number.

It is an amenable number.

4065340561 is a deficient number, since it is larger than the sum of its proper divisors (4904739).

4065340561 is an equidigital number, since it uses as much as digits as its factorization.

4065340561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4904738.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 4065340561 is about 63760.0232198828. The cubic root of 4065340561 is about 1595.9978833072.

The spelling of 4065340561 in words is "four billion, sixty-five million, three hundred forty thousand, five hundred sixty-one".