65511321 has 8 divisors (see below), whose sum is σ = 87831744. Its totient is φ = 43432560.

The previous prime is 65511293. The next prime is 65511323. The reversal of 65511321 is 12311556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65511321 - 2¹⁰ = 65510297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65511291 and 65511300.

It is not an unprimeable number, because it can be changed into a prime (65511323) 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, 59781 + ... + 60866.

It is an arithmetic number, because the mean of its divisors is an integer number (10978968).

Almost surely, 2^65511321 is an apocalyptic number.

It is an amenable number.

65511321 is a deficient number, since it is larger than the sum of its proper divisors (22320423).

65511321 is a wasteful number, since it uses less digits than its factorization.

65511321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120831.

The product of its digits is 900, while the sum is 24.

The square root of 65511321 is about 8093.9064116161. The cubic root of 65511321 is about 403.1241215533.

Adding to 65511321 its reverse (12311556), we get a palindrome (77822877).

The spelling of 65511321 in words is "sixty-five million, five hundred eleven thousand, three hundred twenty-one".