66115603 has 2 divisors, whose sum is σ = 66115604. Its totient is φ = 66115602.

The previous prime is 66115541. The next prime is 66115613. The reversal of 66115603 is 30651166.

66115603 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66115603 is a prime.

It is not a weakly prime, because it can be changed into another prime (66115613) 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, 33057801 + 33057802.

It is an arithmetic number, because the mean of its divisors is an integer number (33057802).

Almost surely, 2^66115603 is an apocalyptic number.

66115603 is a deficient number, since it is larger than the sum of its proper divisors (1).

66115603 is an equidigital number, since it uses as much as digits as its factorization.

66115603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 66115603 is about 8131.1501646446. The cubic root of 66115603 is about 404.3598136636.

Adding to 66115603 its reverse (30651166), we get a palindrome (96766769).

The spelling of 66115603 in words is "sixty-six million, one hundred fifteen thousand, six hundred three".