65601565 has 8 divisors (see below), whose sum is σ = 78972120. Its totient is φ = 52314432.

The previous prime is 65601559. The next prime is 65601577. The reversal of 65601565 is 56510656.

It can be written as a sum of positive squares in 4 ways, for example, as 1505529 + 64096036 = 1227^2 + 8006^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65601565 - 2⁵ = 65601533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65601565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19110 + ... + 22279.

It is an arithmetic number, because the mean of its divisors is an integer number (9871515).

Almost surely, 2^65601565 is an apocalyptic number.

It is an amenable number.

65601565 is a deficient number, since it is larger than the sum of its proper divisors (13370555).

65601565 is a wasteful number, since it uses less digits than its factorization.

65601565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41711.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 65601565 is about 8099.4793042516. The cubic root of 65601565 is about 403.3091422020.

Subtracting from 65601565 its reverse (56510656), we obtain a palindrome (9090909).

It can be divided in two parts, 65601 and 565, that added together give a palindrome (66166).

The spelling of 65601565 in words is "sixty-five million, six hundred one thousand, five hundred sixty-five".