65385809 has 4 divisors (see below), whose sum is σ = 65404416. Its totient is φ = 65367204.

The previous prime is 65385797. The next prime is 65385811. The reversal of 65385809 is 90858356.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65385809 - 2¹² = 65381713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65385809.

It is not an unprimeable number, because it can be changed into a prime (65385889) 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, 2249 + ... + 11654.

It is an arithmetic number, because the mean of its divisors is an integer number (16351104).

Almost surely, 2^65385809 is an apocalyptic number.

It is an amenable number.

65385809 is a deficient number, since it is larger than the sum of its proper divisors (18607).

65385809 is a wasteful number, since it uses less digits than its factorization.

65385809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18606.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 65385809 is about 8086.1492071319. The cubic root of 65385809 is about 402.8665108025.

The spelling of 65385809 in words is "sixty-five million, three hundred eighty-five thousand, eight hundred nine".