1212445404557 has 2 divisors, whose sum is σ = 1212445404558. Its totient is φ = 1212445404556.

The previous prime is 1212445404491. The next prime is 1212445404563. The reversal of 1212445404557 is 7554045442121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1003430937796 + 209014466761 = 1001714^2 + 457181^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212445404557 - 2¹⁸ = 1212445142413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212445404587) 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, 606222702278 + 606222702279.

It is an arithmetic number, because the mean of its divisors is an integer number (606222702279).

Almost surely, 2^{1212445404557} is an apocalyptic number.

It is an amenable number.

1212445404557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212445404557 is an equidigital number, since it uses as much as digits as its factorization.

1212445404557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896000, while the sum is 44.

The spelling of 1212445404557 in words is "one trillion, two hundred twelve billion, four hundred forty-five million, four hundred four thousand, five hundred fifty-seven".