1223456777773 has 2 divisors, whose sum is σ = 1223456777774. Its totient is φ = 1223456777772.

The previous prime is 1223456777771. The next prime is 1223456777797. The reversal of 1223456777773 is 3777776543221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 691588497924 + 531868279849 = 831618^2 + 729293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223456777773 - 2¹ = 1223456777771 is a prime.

Together with 1223456777771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223456777771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611728388886 + 611728388887.

It is an arithmetic number, because the mean of its divisors is an integer number (611728388887).

Almost surely, 2^{1223456777773} is an apocalyptic number.

It is an amenable number.

1223456777773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223456777773 is an equidigital number, since it uses as much as digits as its factorization.

1223456777773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72606240, while the sum is 61.

The spelling of 1223456777773 in words is "one trillion, two hundred twenty-three billion, four hundred fifty-six million, seven hundred seventy-seven thousand, seven hundred seventy-three".