1665880228643 has 2 divisors, whose sum is σ = 1665880228644. Its totient is φ = 1665880228642.

The previous prime is 1665880228637. The next prime is 1665880228651. The reversal of 1665880228643 is 3468220885661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1665880228643 - 2⁴ = 1665880228627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1665880228633) 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, 832940114321 + 832940114322.

It is an arithmetic number, because the mean of its divisors is an integer number (832940114322).

Almost surely, 2^{1665880228643} is an apocalyptic number.

1665880228643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665880228643 is an equidigital number, since it uses as much as digits as its factorization.

1665880228643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26542080, while the sum is 59.

The spelling of 1665880228643 in words is "one trillion, six hundred sixty-five billion, eight hundred eighty million, two hundred twenty-eight thousand, six hundred forty-three".