65116209 has 4 divisors (see below), whose sum is σ = 86821616. Its totient is φ = 43410804.

The previous prime is 65116201. The next prime is 65116217. The reversal of 65116209 is 90261156.

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 an interprime number because it is at equal distance from previous prime (65116201) and next prime (65116217).

It is not a de Polignac number, because 65116209 - 2³ = 65116201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65116201) 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, 10852699 + ... + 10852704.

It is an arithmetic number, because the mean of its divisors is an integer number (21705404).

Almost surely, 2^65116209 is an apocalyptic number.

It is an amenable number.

65116209 is a deficient number, since it is larger than the sum of its proper divisors (21705407).

65116209 is a wasteful number, since it uses less digits than its factorization.

65116209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21705406.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 65116209 is about 8069.4615061973. The cubic root of 65116209 is about 402.3120457792.

It can be divided in two parts, 6511 and 6209, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 65116209 in words is "sixty-five million, one hundred sixteen thousand, two hundred nine".