1272837638393 has 2 divisors, whose sum is σ = 1272837638394. Its totient is φ = 1272837638392.

The previous prime is 1272837638381. The next prime is 1272837638399. The reversal of 1272837638393 is 3938367382721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1250722379449 + 22115258944 = 1118357^2 + 148712^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272837638393 - 2⁶ = 1272837638329 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 (1272837638399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636418819196 + 636418819197.

It is an arithmetic number, because the mean of its divisors is an integer number (636418819197).

Almost surely, 2^{1272837638393} is an apocalyptic number.

It is an amenable number.

1272837638393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272837638393 is an equidigital number, since it uses as much as digits as its factorization.

1272837638393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 62.

The spelling of 1272837638393 in words is "one trillion, two hundred seventy-two billion, eight hundred thirty-seven million, six hundred thirty-eight thousand, three hundred ninety-three".