65133520 has 80 divisors (see below), whose sum is σ = 161864640. Its totient is φ = 24302592.

The previous prime is 65133517. The next prime is 65133527. The reversal of 65133520 is 2533156.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65133527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110667 + ... + 111253.

It is an arithmetic number, because the mean of its divisors is an integer number (2023308).

Almost surely, 2^65133520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65133520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80932320).

65133520 is an abundant number, since it is smaller than the sum of its proper divisors (96731120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65133520 is a wasteful number, since it uses less digits than its factorization.

65133520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 65133520 is about 8070.5340591562. The cubic root of 65133520 is about 402.3476938759.

Adding to 65133520 its reverse (2533156), we get a palindrome (67666676).

The spelling of 65133520 in words is "sixty-five million, one hundred thirty-three thousand, five hundred twenty".