66938603 has 2 divisors, whose sum is σ = 66938604. Its totient is φ = 66938602.

The previous prime is 66938581. The next prime is 66938623. The reversal of 66938603 is 30683966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66938603 - 2¹⁰ = 66937579 is a prime.

It is not a weakly prime, because it can be changed into another prime (66938623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33469301 + 33469302.

It is an arithmetic number, because the mean of its divisors is an integer number (33469302).

Almost surely, 2^66938603 is an apocalyptic number.

66938603 is a deficient number, since it is larger than the sum of its proper divisors (1).

66938603 is an equidigital number, since it uses as much as digits as its factorization.

66938603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 66938603 is about 8181.6014935952. The cubic root of 66938603 is about 406.0307090105.

The spelling of 66938603 in words is "sixty-six million, nine hundred thirty-eight thousand, six hundred three".