1216819747673 has 2 divisors, whose sum is σ = 1216819747674. Its totient is φ = 1216819747672.

The previous prime is 1216819747601. The next prime is 1216819747687. The reversal of 1216819747673 is 3767479186121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1054219669504 + 162600078169 = 1026752^2 + 403237^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216819747673 - 2¹² = 1216819743577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1216819746673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608409873836 + 608409873837.

It is an arithmetic number, because the mean of its divisors is an integer number (608409873837).

Almost surely, 2^{1216819747673} is an apocalyptic number.

It is an amenable number.

1216819747673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216819747673 is an equidigital number, since it uses as much as digits as its factorization.

1216819747673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 62.

The spelling of 1216819747673 in words is "one trillion, two hundred sixteen billion, eight hundred nineteen million, seven hundred forty-seven thousand, six hundred seventy-three".