65530321 has 4 divisors (see below), whose sum is σ = 65598372. Its totient is φ = 65462272.

The previous prime is 65530319. The next prime is 65530369. The reversal of 65530321 is 12303556.

It is a happy number.

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 61449921 + 4080400 = 7839^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 65530321 - 2¹ = 65530319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65530391) by changing a digit.

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, 32560 + ... + 34513.

It is an arithmetic number, because the mean of its divisors is an integer number (16399593).

Almost surely, 2^65530321 is an apocalyptic number.

It is an amenable number.

65530321 is a deficient number, since it is larger than the sum of its proper divisors (68051).

65530321 is an equidigital number, since it uses as much as digits as its factorization.

65530321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68050.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 65530321 is about 8095.0800490174. The cubic root of 65530321 is about 403.1630899730.

Adding to 65530321 its reverse (12303556), we get a palindrome (77833877).

It can be divided in two parts, 655 and 30321, that added together give a square (30976 = 176²).

The spelling of 65530321 in words is "sixty-five million, five hundred thirty thousand, three hundred twenty-one".