66755474461771 has 2 divisors, whose sum is σ = 66755474461772. Its totient is φ = 66755474461770.

The previous prime is 66755474461699. The next prime is 66755474461813. The reversal of 66755474461771 is 17716447455766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66755474461771 - 2¹⁹ = 66755473937483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66755474461771.

It is not a weakly prime, because it can be changed into another prime (66755474467771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33377737230885 + 33377737230886.

It is an arithmetic number, because the mean of its divisors is an integer number (33377737230886).

Almost surely, 2^{66755474461771} is an apocalyptic number.

66755474461771 is a deficient number, since it is larger than the sum of its proper divisors (1).

66755474461771 is an equidigital number, since it uses as much as digits as its factorization.

66755474461771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829785600, while the sum is 70.

The spelling of 66755474461771 in words is "sixty-six trillion, seven hundred fifty-five billion, four hundred seventy-four million, four hundred sixty-one thousand, seven hundred seventy-one".