1273939665457 has 2 divisors, whose sum is σ = 1273939665458. Its totient is φ = 1273939665456.

The previous prime is 1273939665403. The next prime is 1273939665469. The reversal of 1273939665457 is 7545669393721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267873748001 + 6065917456 = 1125999^2 + 77884^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273939665457 - 2¹⁵ = 1273939632689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1273939665392 and 1273939665401.

It is not a weakly prime, because it can be changed into another prime (1273939665487) 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, 636969832728 + 636969832729.

It is an arithmetic number, because the mean of its divisors is an integer number (636969832729).

Almost surely, 2^{1273939665457} is an apocalyptic number.

It is an amenable number.

1273939665457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273939665457 is an equidigital number, since it uses as much as digits as its factorization.

1273939665457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 257191200, while the sum is 67.

The spelling of 1273939665457 in words is "one trillion, two hundred seventy-three billion, nine hundred thirty-nine million, six hundred sixty-five thousand, four hundred fifty-seven".