65643601 has 2 divisors, whose sum is σ = 65643602. Its totient is φ = 65643600.

The previous prime is 65643581. The next prime is 65643607. The reversal of 65643601 is 10634656.

65643601 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., 64641600 + 1002001 = 8040^2 + 1001^2 .

It is a cyclic number.

It is not a de Polignac number, because 65643601 - 2⁵ = 65643569 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65643607) 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, 32821800 + 32821801.

It is an arithmetic number, because the mean of its divisors is an integer number (32821801).

Almost surely, 2^65643601 is an apocalyptic number.

It is an amenable number.

65643601 is a deficient number, since it is larger than the sum of its proper divisors (1).

65643601 is an equidigital number, since it uses as much as digits as its factorization.

65643601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 65643601 is about 8102.0738703125. The cubic root of 65643601 is about 403.3952676029.

The spelling of 65643601 in words is "sixty-five million, six hundred forty-three thousand, six hundred one".