65601649 has 2 divisors, whose sum is σ = 65601650. Its totient is φ = 65601648.

The previous prime is 65601583. The next prime is 65601659. The reversal of 65601649 is 94610656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38353249 + 27248400 = 6193^2 + 5220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65601649 is a prime.

It is not a weakly prime, because it can be changed into another prime (65601659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32800824 + 32800825.

It is an arithmetic number, because the mean of its divisors is an integer number (32800825).

Almost surely, 2^65601649 is an apocalyptic number.

It is an amenable number.

65601649 is a deficient number, since it is larger than the sum of its proper divisors (1).

65601649 is an equidigital number, since it uses as much as digits as its factorization.

65601649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 65601649 is about 8099.4844897685. The cubic root of 65601649 is about 403.3093143420.

The spelling of 65601649 in words is "sixty-five million, six hundred one thousand, six hundred forty-nine".