65416221 has 64 divisors (see below), whose sum is σ = 116524800. Its totient is φ = 35831808.

The previous prime is 65416213. The next prime is 65416283. The reversal of 65416221 is 12261456.

65416221 is a `hidden beast` number, since 654 + 1 + 6 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 65416221 - 2³ = 65416213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65416921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 113085 + ... + 113661.

It is an arithmetic number, because the mean of its divisors is an integer number (1820700).

Almost surely, 2^65416221 is an apocalyptic number.

It is an amenable number.

65416221 is a deficient number, since it is larger than the sum of its proper divisors (51108579).

65416221 is a wasteful number, since it uses less digits than its factorization.

65416221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 629 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 65416221 is about 8088.0294880768. The cubic root of 65416221 is about 402.9289610368.

Adding to 65416221 its reverse (12261456), we get a palindrome (77677677).

The spelling of 65416221 in words is "sixty-five million, four hundred sixteen thousand, two hundred twenty-one".