1218880000073 has 2 divisors, whose sum is σ = 1218880000074. Its totient is φ = 1218880000072.

The previous prime is 1218880000021. The next prime is 1218880000147. The reversal of 1218880000073 is 3700000888121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 937000768144 + 281879231929 = 967988^2 + 530923^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218880000073 - 2³² = 1214585032777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1218879999991 and 1218880000036.

It is not a weakly prime, because it can be changed into another prime (1218880000573) 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, 609440000036 + 609440000037.

It is an arithmetic number, because the mean of its divisors is an integer number (609440000037).

Almost surely, 2^{1218880000073} is an apocalyptic number.

It is an amenable number.

1218880000073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218880000073 is an equidigital number, since it uses as much as digits as its factorization.

1218880000073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 38.

Adding to 1218880000073 its reverse (3700000888121), we get a palindrome (4918880888194).

The spelling of 1218880000073 in words is "one trillion, two hundred eighteen billion, eight hundred eighty million, seventy-three", and thus it is an aban number.