65332521 has 8 divisors (see below), whose sum is σ = 96788960. Its totient is φ = 43554996.

The previous prime is 65332471. The next prime is 65332543. The reversal of 65332521 is 12523356.

65332521 is a `hidden beast` number, since 653 + 3 + 2 + 5 + 2 + 1 = 666.

It is not a de Polignac number, because 65332521 - 2⁹ = 65332009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2419723 = 65332521 / (6 + 5 + 3 + 3 + 2 + 5 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65332321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1209835 + ... + 1209888.

It is an arithmetic number, because the mean of its divisors is an integer number (12098620).

Almost surely, 2^65332521 is an apocalyptic number.

It is an amenable number.

65332521 is a deficient number, since it is larger than the sum of its proper divisors (31456439).

65332521 is a wasteful number, since it uses less digits than its factorization.

65332521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2419732 (or 2419726 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 65332521 is about 8082.8535184055. The cubic root of 65332521 is about 402.7570386017.

Adding to 65332521 its reverse (12523356), we get a palindrome (77855877).

The spelling of 65332521 in words is "sixty-five million, three hundred thirty-two thousand, five hundred twenty-one".