65165521 has 2 divisors, whose sum is σ = 65165522. Its totient is φ = 65165520.

The previous prime is 65165491. The next prime is 65165531. The reversal of 65165521 is 12556156.

65165521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62489025 + 2676496 = 7905^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 65165521 - 2⁵ = 65165489 is a prime.

It is not a weakly prime, because it can be changed into another prime (65165531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32582760 + 32582761.

It is an arithmetic number, because the mean of its divisors is an integer number (32582761).

Almost surely, 2^65165521 is an apocalyptic number.

It is an amenable number.

65165521 is a deficient number, since it is larger than the sum of its proper divisors (1).

65165521 is an equidigital number, since it uses as much as digits as its factorization.

65165521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 31.

The square root of 65165521 is about 8072.5163982491. The cubic root of 65165521 is about 402.4135760847.

The spelling of 65165521 in words is "sixty-five million, one hundred sixty-five thousand, five hundred twenty-one".