66603738827 has 2 divisors, whose sum is σ = 66603738828. Its totient is φ = 66603738826.

The previous prime is 66603738787. The next prime is 66603738833. The reversal of 66603738827 is 72883730666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66603738827 - 2¹⁰ = 66603737803 is a prime.

It is not a weakly prime, because it can be changed into another prime (66603738127) 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, 33301869413 + 33301869414.

It is an arithmetic number, because the mean of its divisors is an integer number (33301869414).

Almost surely, 2^66603738827 is an apocalyptic number.

66603738827 is a deficient number, since it is larger than the sum of its proper divisors (1).

66603738827 is an equidigital number, since it uses as much as digits as its factorization.

66603738827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12192768, while the sum is 56.

The spelling of 66603738827 in words is "sixty-six billion, six hundred three million, seven hundred thirty-eight thousand, eight hundred twenty-seven".