66608603 has 2 divisors, whose sum is σ = 66608604. Its totient is φ = 66608602.

The previous prime is 66608599. The next prime is 66608609. The reversal of 66608603 is 30680666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66608603 - 2² = 66608599 is a prime.

It is a super-2 number, since 2×66608603² = 8873411987223218, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66608609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33304301 + 33304302.

It is an arithmetic number, because the mean of its divisors is an integer number (33304302).

Almost surely, 2^66608603 is an apocalyptic number.

66608603 is a deficient number, since it is larger than the sum of its proper divisors (1).

66608603 is an equidigital number, since it uses as much as digits as its factorization.

66608603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 66608603 is about 8161.4093758370. The cubic root of 66608603 is about 405.3623805295.

The spelling of 66608603 in words is "sixty-six million, six hundred eight thousand, six hundred three".