65106809 has 4 divisors (see below), whose sum is σ = 65271204. Its totient is φ = 64942416.

The previous prime is 65106803. The next prime is 65106829. The reversal of 65106809 is 90860156.

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 24720784 + 40386025 = 4972^2 + 6355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65106809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65106803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81602 + ... + 82395.

It is an arithmetic number, because the mean of its divisors is an integer number (16317801).

Almost surely, 2^65106809 is an apocalyptic number.

It is an amenable number.

65106809 is a deficient number, since it is larger than the sum of its proper divisors (164395).

65106809 is a wasteful number, since it uses less digits than its factorization.

65106809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164394.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 65106809 is about 8068.8790423453. The cubic root of 65106809 is about 402.2926859543.

The spelling of 65106809 in words is "sixty-five million, one hundred six thousand, eight hundred nine".