66774033743171 has 2 divisors, whose sum is σ = 66774033743172. Its totient is φ = 66774033743170.

The previous prime is 66774033743149. The next prime is 66774033743273. The reversal of 66774033743171 is 17134733047766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66774033743171 - 2¹⁴ = 66774033726787 is a prime.

It is a super-3 number, since 3×66774033743171³ (a number of 42 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66774033743171.

It is not a weakly prime, because it can be changed into another prime (66774033743371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387016871585 + 33387016871586.

It is an arithmetic number, because the mean of its divisors is an integer number (33387016871586).

Almost surely, 2^{66774033743171} is an apocalyptic number.

66774033743171 is a deficient number, since it is larger than the sum of its proper divisors (1).

66774033743171 is an equidigital number, since it uses as much as digits as its factorization.

66774033743171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37340352, while the sum is 59.

The spelling of 66774033743171 in words is "sixty-six trillion, seven hundred seventy-four billion, thirty-three million, seven hundred forty-three thousand, one hundred seventy-one".