65511265 has 4 divisors (see below), whose sum is σ = 78613524. Its totient is φ = 52409008.

The previous prime is 65511247. The next prime is 65511293. The reversal of 65511265 is 56211556.

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 11209104 + 54302161 = 3348^2 + 7369^2 .

It is a cyclic number.

It is not a de Polignac number, because 65511265 - 2⁷ = 65511137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6551122 + ... + 6551131.

It is an arithmetic number, because the mean of its divisors is an integer number (19653381).

Almost surely, 2^65511265 is an apocalyptic number.

It is an amenable number.

65511265 is a deficient number, since it is larger than the sum of its proper divisors (13102259).

65511265 is a wasteful number, since it uses less digits than its factorization.

65511265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13102258.

The product of its digits is 9000, while the sum is 31.

The square root of 65511265 is about 8093.9029522227. The cubic root of 65511265 is about 403.1240066879.

The spelling of 65511265 in words is "sixty-five million, five hundred eleven thousand, two hundred sixty-five".