66563596811 has 2 divisors, whose sum is σ = 66563596812. Its totient is φ = 66563596810.

The previous prime is 66563596787. The next prime is 66563596829. The reversal of 66563596811 is 11869536566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66563596811 is a prime.

It is not a weakly prime, because it can be changed into another prime (66563596871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33281798405 + 33281798406.

It is an arithmetic number, because the mean of its divisors is an integer number (33281798406).

Almost surely, 2^66563596811 is an apocalyptic number.

66563596811 is a deficient number, since it is larger than the sum of its proper divisors (1).

66563596811 is an equidigital number, since it uses as much as digits as its factorization.

66563596811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 56.

The spelling of 66563596811 in words is "sixty-six billion, five hundred sixty-three million, five hundred ninety-six thousand, eight hundred eleven".