1223445666791 has 2 divisors, whose sum is σ = 1223445666792. Its totient is φ = 1223445666790.

The previous prime is 1223445666727. The next prime is 1223445666847. The reversal of 1223445666791 is 1976665443221.

It is an a-pointer prime, because the next prime (1223445666847) can be obtained adding 1223445666791 to its sum of digits (56).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1223445666791 - 2⁶ = 1223445666727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223445666491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611722833395 + 611722833396.

It is an arithmetic number, because the mean of its divisors is an integer number (611722833396).

Almost surely, 2^{1223445666791} is an apocalyptic number.

1223445666791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223445666791 is an equidigital number, since it uses as much as digits as its factorization.

1223445666791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 56.

The spelling of 1223445666791 in words is "one trillion, two hundred twenty-three billion, four hundred forty-five million, six hundred sixty-six thousand, seven hundred ninety-one".