1779849640813 has 2 divisors, whose sum is σ = 1779849640814. Its totient is φ = 1779849640812.

The previous prime is 1779849640799. The next prime is 1779849640823. The reversal of 1779849640813 is 3180469489771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1746169316329 + 33680324484 = 1321427^2 + 183522^2 .

It is a cyclic number.

It is not a de Polignac number, because 1779849640813 - 2¹⁷ = 1779849509741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1779849640823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889924820406 + 889924820407.

It is an arithmetic number, because the mean of its divisors is an integer number (889924820407).

Almost surely, 2^{1779849640813} is an apocalyptic number.

It is an amenable number.

1779849640813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1779849640813 is an equidigital number, since it uses as much as digits as its factorization.

1779849640813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73156608, while the sum is 67.

The spelling of 1779849640813 in words is "one trillion, seven hundred seventy-nine billion, eight hundred forty-nine million, six hundred forty thousand, eight hundred thirteen".