65016221 has 4 divisors (see below), whose sum is σ = 65446944. Its totient is φ = 64585500.

The previous prime is 65016187. The next prime is 65016229. The reversal of 65016221 is 12261056.

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 a de Polignac number, because none of the positive numbers 2^k-65016221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65016229) 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, 215135 + ... + 215436.

It is an arithmetic number, because the mean of its divisors is an integer number (16361736).

Almost surely, 2^65016221 is an apocalyptic number.

It is an amenable number.

65016221 is a deficient number, since it is larger than the sum of its proper divisors (430723).

65016221 is a wasteful number, since it uses less digits than its factorization.

65016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430722.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 65016221 is about 8063.2636692595. The cubic root of 65016221 is about 402.1060193297.

Adding to 65016221 its reverse (12261056), we get a palindrome (77277277).

The spelling of 65016221 in words is "sixty-five million, sixteen thousand, two hundred twenty-one".