63666745281871 has 2 divisors, whose sum is σ = 63666745281872. Its totient is φ = 63666745281870.

The previous prime is 63666745281833. The next prime is 63666745281889. The reversal of 63666745281871 is 17818254766636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63666745281871 - 2²¹ = 63666743184719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63666745281871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63666745281071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31833372640935 + 31833372640936.

It is an arithmetic number, because the mean of its divisors is an integer number (31833372640936).

Almost surely, 2^{63666745281871} is an apocalyptic number.

63666745281871 is a deficient number, since it is larger than the sum of its proper divisors (1).

63666745281871 is an equidigital number, since it uses as much as digits as its factorization.

63666745281871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 487710720, while the sum is 70.

The spelling of 63666745281871 in words is "sixty-three trillion, six hundred sixty-six billion, seven hundred forty-five million, two hundred eighty-one thousand, eight hundred seventy-one".