66563596787 has 2 divisors, whose sum is σ = 66563596788. Its totient is φ = 66563596786.

The previous prime is 66563596753. The next prime is 66563596811. The reversal of 66563596787 is 78769536566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66563596787 is a prime.

It is not a weakly prime, because it can be changed into another prime (66563596387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33281798393 + 33281798394.

It is an arithmetic number, because the mean of its divisors is an integer number (33281798394).

Almost surely, 2^66563596787 is an apocalyptic number.

66563596787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66563596787 is an equidigital number, since it uses as much as digits as its factorization.

66563596787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 342921600, while the sum is 68.

The spelling of 66563596787 in words is "sixty-six billion, five hundred sixty-three million, five hundred ninety-six thousand, seven hundred eighty-seven".