65561603 has 2 divisors, whose sum is σ = 65561604. Its totient is φ = 65561602.

The previous prime is 65561597. The next prime is 65561611. The reversal of 65561603 is 30616556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65561603 - 2⁶ = 65561539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65561603.

It is not a weakly prime, because it can be changed into another prime (65561653) 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, 32780801 + 32780802.

It is an arithmetic number, because the mean of its divisors is an integer number (32780802).

Almost surely, 2^65561603 is an apocalyptic number.

65561603 is a deficient number, since it is larger than the sum of its proper divisors (1).

65561603 is an equidigital number, since it uses as much as digits as its factorization.

65561603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 65561603 is about 8097.0119797367. The cubic root of 65561603 is about 403.2272319931.

The spelling of 65561603 in words is "sixty-five million, five hundred sixty-one thousand, six hundred three".