65245509 has 18 divisors (see below), whose sum is σ = 109630950. Its totient is φ = 37282896.

The previous prime is 65245501. The next prime is 65245513. The reversal of 65245509 is 90554256.

65245509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 64352484 + 893025 = 8022^2 + 945^2 .

It is not a de Polignac number, because 65245509 - 2³ = 65245501 is a prime.

It is a super-3 number, since 3×65245509³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65245501) 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 17 ways as a sum of consecutive naturals, for example, 73534 + ... + 74415.

Almost surely, 2^65245509 is an apocalyptic number.

It is an amenable number.

65245509 is a deficient number, since it is larger than the sum of its proper divisors (44385441).

65245509 is a wasteful number, since it uses less digits than its factorization.

65245509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147969 (or 147959 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 65245509 is about 8077.4692199971. The cubic root of 65245509 is about 402.5781574752.

The spelling of 65245509 in words is "sixty-five million, two hundred forty-five thousand, five hundred nine".