1660381784071 has 2 divisors, whose sum is σ = 1660381784072. Its totient is φ = 1660381784070.

The previous prime is 1660381784057. The next prime is 1660381784077. The reversal of 1660381784071 is 1704871830661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1660381784071 - 2²¹ = 1660379686919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660381784077) 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, 830190892035 + 830190892036.

It is an arithmetic number, because the mean of its divisors is an integer number (830190892036).

Almost surely, 2^{1660381784071} is an apocalyptic number.

1660381784071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660381784071 is an equidigital number, since it uses as much as digits as its factorization.

1660381784071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 1660381784071 in words is "one trillion, six hundred sixty billion, three hundred eighty-one million, seven hundred eighty-four thousand, seventy-one".