1778842627613 has 2 divisors, whose sum is σ = 1778842627614. Its totient is φ = 1778842627612.

The previous prime is 1778842627609. The next prime is 1778842627631. The reversal of 1778842627613 is 3167262488771.

Together with next prime (1778842627631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1356449220889 + 422393406724 = 1164667^2 + 649918^2 .

It is a cyclic number.

It is not a de Polignac number, because 1778842627613 - 2² = 1778842627609 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 (1778842627813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889421313806 + 889421313807.

It is an arithmetic number, because the mean of its divisors is an integer number (889421313807).

Almost surely, 2^{1778842627613} is an apocalyptic number.

It is an amenable number.

1778842627613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1778842627613 is an equidigital number, since it uses as much as digits as its factorization.

1778842627613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37933056, while the sum is 62.

The spelling of 1778842627613 in words is "one trillion, seven hundred seventy-eight billion, eight hundred forty-two million, six hundred twenty-seven thousand, six hundred thirteen".