66600563 has 2 divisors, whose sum is σ = 66600564. Its totient is φ = 66600562.

The previous prime is 66600539. The next prime is 66600581. The reversal of 66600563 is 36500666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66600563 - 2¹⁴ = 66584179 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (66600503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33300281 + 33300282.

It is an arithmetic number, because the mean of its divisors is an integer number (33300282).

Almost surely, 2^66600563 is an apocalyptic number.

66600563 is a deficient number, since it is larger than the sum of its proper divisors (1).

66600563 is an equidigital number, since it uses as much as digits as its factorization.

66600563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 66600563 is about 8160.9167989877. The cubic root of 66600563 is about 405.3460701004.

The spelling of 66600563 in words is "sixty-six million, six hundred thousand, five hundred sixty-three".