66603738787 has 2 divisors, whose sum is σ = 66603738788. Its totient is φ = 66603738786.

The previous prime is 66603738769. The next prime is 66603738827. The reversal of 66603738787 is 78783730666.

66603738787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66603738787 is a prime.

It is not a weakly prime, because it can be changed into another prime (66603738737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33301869393 + 33301869394.

It is an arithmetic number, because the mean of its divisors is an integer number (33301869394).

Almost surely, 2^66603738787 is an apocalyptic number.

66603738787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66603738787 is an equidigital number, since it uses as much as digits as its factorization.

66603738787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42674688, while the sum is 61.

The spelling of 66603738787 in words is "sixty-six billion, six hundred three million, seven hundred thirty-eight thousand, seven hundred eighty-seven".