65561165 has 4 divisors (see below), whose sum is σ = 78673404. Its totient is φ = 52448928.

The previous prime is 65561143. The next prime is 65561189. The reversal of 65561165 is 56116556.

65561165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 25593481 + 39967684 = 5059^2 + 6322^2 .

It is a cyclic number.

It is not a de Polignac number, because 65561165 - 2⁶ = 65561101 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6556112 + ... + 6556121.

It is an arithmetic number, because the mean of its divisors is an integer number (19668351).

Almost surely, 2^65561165 is an apocalyptic number.

It is an amenable number.

65561165 is a deficient number, since it is larger than the sum of its proper divisors (13112239).

65561165 is a wasteful number, since it uses less digits than its factorization.

65561165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13112238.

The product of its digits is 27000, while the sum is 35.

The square root of 65561165 is about 8096.9849326771. The cubic root of 65561165 is about 403.2263340391.

The spelling of 65561165 in words is "sixty-five million, five hundred sixty-one thousand, one hundred sixty-five".