65864021 has 2 divisors, whose sum is σ = 65864022. Its totient is φ = 65864020.

The previous prime is 65864011. The next prime is 65864027. The reversal of 65864021 is 12046856.

65864021 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., 47416996 + 18447025 = 6886^2 + 4295^2 .

It is a cyclic number.

It is not a de Polignac number, because 65864021 - 2¹⁴ = 65847637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65864027) 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, 32932010 + 32932011.

It is an arithmetic number, because the mean of its divisors is an integer number (32932011).

Almost surely, 2^65864021 is an apocalyptic number.

It is an amenable number.

65864021 is a deficient number, since it is larger than the sum of its proper divisors (1).

65864021 is an equidigital number, since it uses as much as digits as its factorization.

65864021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 65864021 is about 8115.6651606630. The cubic root of 65864021 is about 403.8462739805.

The spelling of 65864021 in words is "sixty-five million, eight hundred sixty-four thousand, twenty-one".