66803963 has 2 divisors, whose sum is σ = 66803964. Its totient is φ = 66803962.

The previous prime is 66803959. The next prime is 66804011. The reversal of 66803963 is 36930866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66803963 - 2² = 66803959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66803963.

It is not a weakly prime, because it can be changed into another prime (66803953) 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, 33401981 + 33401982.

It is an arithmetic number, because the mean of its divisors is an integer number (33401982).

Almost surely, 2^66803963 is an apocalyptic number.

66803963 is a deficient number, since it is larger than the sum of its proper divisors (1).

66803963 is an equidigital number, since it uses as much as digits as its factorization.

66803963 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 66803963 is about 8173.3691339618. The cubic root of 66803963 is about 405.7582968487.

The spelling of 66803963 in words is "sixty-six million, eight hundred three thousand, nine hundred sixty-three".