1263917801693 has 2 divisors, whose sum is σ = 1263917801694. Its totient is φ = 1263917801692.

The previous prime is 1263917801651. The next prime is 1263917801747. The reversal of 1263917801693 is 3961087193621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1193396750329 + 70521051364 = 1092427^2 + 265558^2 .

It is an emirp because it is prime and its reverse (3961087193621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1263917801693 - 2⁸ = 1263917801437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263917801633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631958900846 + 631958900847.

It is an arithmetic number, because the mean of its divisors is an integer number (631958900847).

Almost surely, 2^{1263917801693} is an apocalyptic number.

It is an amenable number.

1263917801693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263917801693 is an equidigital number, since it uses as much as digits as its factorization.

1263917801693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The spelling of 1263917801693 in words is "one trillion, two hundred sixty-three billion, nine hundred seventeen million, eight hundred one thousand, six hundred ninety-three".