65425221 has 12 divisors (see below), whose sum is σ = 97552000. Its totient is φ = 42209640.

The previous prime is 65425219. The next prime is 65425223. The reversal of 65425221 is 12252456.

65425221 is a `hidden beast` number, since 654 + 2 + 5 + 2 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (65425219) and next prime (65425223).

It is not a de Polignac number, because 65425221 - 2¹ = 65425219 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65425223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116971 + ... + 117528.

Almost surely, 2^65425221 is an apocalyptic number.

It is an amenable number.

65425221 is a deficient number, since it is larger than the sum of its proper divisors (32126779).

65425221 is a wasteful number, since it uses less digits than its factorization.

65425221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234536 (or 234533 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 65425221 is about 8088.5858467349. The cubic root of 65425221 is about 402.9474385862.

Adding to 65425221 its reverse (12252456), we get a palindrome (77677677).

The spelling of 65425221 in words is "sixty-five million, four hundred twenty-five thousand, two hundred twenty-one".