65560221 has 24 divisors (see below), whose sum is σ = 96370560. Its totient is φ = 42942816.

The previous prime is 65560199. The next prime is 65560223. The reversal of 65560221 is 12206556.

65560221 is a `hidden beast` number, since 6 + 55 + 602 + 2 + 1 = 666.

It is not a de Polignac number, because 65560221 - 2¹¹ = 65558173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65560223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182440 + ... + 182798.

It is an arithmetic number, because the mean of its divisors is an integer number (4015440).

Almost surely, 2^65560221 is an apocalyptic number.

It is an amenable number.

65560221 is a deficient number, since it is larger than the sum of its proper divisors (30810339).

65560221 is a wasteful number, since it uses less digits than its factorization.

65560221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 65560221 is about 8096.9266391638. The cubic root of 65560221 is about 403.2243987090.

Adding to 65560221 its reverse (12206556), we get a palindrome (77766777).

The spelling of 65560221 in words is "sixty-five million, five hundred sixty thousand, two hundred twenty-one".