65345221 has 4 divisors (see below), whose sum is σ = 65956032. Its totient is φ = 64734412.

The previous prime is 65345197. The next prime is 65345279. The reversal of 65345221 is 12254356.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65345221 - 2¹⁹ = 64820933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65345221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65346221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305245 + ... + 305458.

It is an arithmetic number, because the mean of its divisors is an integer number (16489008).

Almost surely, 2^65345221 is an apocalyptic number.

It is an amenable number.

65345221 is a deficient number, since it is larger than the sum of its proper divisors (610811).

65345221 is a wasteful number, since it uses less digits than its factorization.

65345221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610810.

The product of its digits is 7200, while the sum is 28.

The square root of 65345221 is about 8083.6390938735. The cubic root of 65345221 is about 402.7831342475.

Adding to 65345221 its reverse (12254356), we get a palindrome (77599577).

The spelling of 65345221 in words is "sixty-five million, three hundred forty-five thousand, two hundred twenty-one".