65500321 has 2 divisors, whose sum is σ = 65500322. Its totient is φ = 65500320.

The previous prime is 65500319. The next prime is 65500349. The reversal of 65500321 is 12300556.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52359696 + 13140625 = 7236^2 + 3625^2 .

It is a cyclic number.

It is not a de Polignac number, because 65500321 - 2¹ = 65500319 is a prime.

It is a super-2 number, since 2×65500321² = 8580584102206082, which contains 22 as substring.

Together with 65500319, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 65500292 and 65500301.

It is not a weakly prime, because it can be changed into another prime (65500361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32750160 + 32750161.

It is an arithmetic number, because the mean of its divisors is an integer number (32750161).

Almost surely, 2^65500321 is an apocalyptic number.

It is an amenable number.

65500321 is a deficient number, since it is larger than the sum of its proper divisors (1).

65500321 is an equidigital number, since it uses as much as digits as its factorization.

65500321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 65500321 is about 8093.2268595413. The cubic root of 65500321 is about 403.1015574454.

Adding to 65500321 its reverse (12300556), we get a palindrome (77800877).

The spelling of 65500321 in words is "sixty-five million, five hundred thousand, three hundred twenty-one".