66556006603 has 2 divisors, whose sum is σ = 66556006604. Its totient is φ = 66556006602.

The previous prime is 66556006597. The next prime is 66556006639. The reversal of 66556006603 is 30660065566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66556006603 - 2¹⁷ = 66555875531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66556006603.

It is not a weakly prime, because it can be changed into another prime (66556006003) 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, 33278003301 + 33278003302.

It is an arithmetic number, because the mean of its divisors is an integer number (33278003302).

Almost surely, 2^66556006603 is an apocalyptic number.

66556006603 is a deficient number, since it is larger than the sum of its proper divisors (1).

66556006603 is an equidigital number, since it uses as much as digits as its factorization.

66556006603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 43.

The spelling of 66556006603 in words is "sixty-six billion, five hundred fifty-six million, six thousand, six hundred three".