1242553615757 has 2 divisors, whose sum is σ = 1242553615758. Its totient is φ = 1242553615756.

The previous prime is 1242553615741. The next prime is 1242553615811. The reversal of 1242553615757 is 7575163552421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 860170922116 + 382382693641 = 927454^2 + 618371^2 .

It is an emirp because it is prime and its reverse (7575163552421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242553615757 - 2⁴ = 1242553615741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242553615699 and 1242553615708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242558615757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621276807878 + 621276807879.

It is an arithmetic number, because the mean of its divisors is an integer number (621276807879).

Almost surely, 2^{1242553615757} is an apocalyptic number.

It is an amenable number.

1242553615757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242553615757 is an equidigital number, since it uses as much as digits as its factorization.

1242553615757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820000, while the sum is 53.

The spelling of 1242553615757 in words is "one trillion, two hundred forty-two billion, five hundred fifty-three million, six hundred fifteen thousand, seven hundred fifty-seven".