65521221652324 has 27 divisors (see below), whose sum is σ = 114782471641593. Its totient is φ = 32726265786288.

The previous prime is 65521221652321. The next prime is 65521221652349. The reversal of 65521221652324 is 42325612212556.

The square root of 65521221652324 is 8094518.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 48442574404900 + 17078647247424 = 6960070^2 + 4132632^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65521221652321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23425533694 + ... + 23425536490.

Almost surely, 2^{65521221652324} is an apocalyptic number.

65521221652324 is the 8094518-th square number.

It is an amenable number.

65521221652324 is a deficient number, since it is larger than the sum of its proper divisors (49261249989269).

65521221652324 is an frugal number, since it uses more digits than its factorization.

65521221652324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8492 (or 4246 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 46.

The spelling of 65521221652324 in words is "sixty-five trillion, five hundred twenty-one billion, two hundred twenty-one million, six hundred fifty-two thousand, three hundred twenty-four".