1779849640693 has 2 divisors, whose sum is σ = 1779849640694. Its totient is φ = 1779849640692.

The previous prime is 1779849640661. The next prime is 1779849640759. The reversal of 1779849640693 is 3960469489771.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1518026054724 + 261823585969 = 1232082^2 + 511687^2 .

It is a cyclic number.

It is not a de Polignac number, because 1779849640693 - 2⁵ = 1779849640661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1779849640643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889924820346 + 889924820347.

It is an arithmetic number, because the mean of its divisors is an integer number (889924820347).

Almost surely, 2^{1779849640693} is an apocalyptic number.

It is an amenable number.

1779849640693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1779849640693 is an equidigital number, since it uses as much as digits as its factorization.

1779849640693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 493807104, while the sum is 73.

The spelling of 1779849640693 in words is "one trillion, seven hundred seventy-nine billion, eight hundred forty-nine million, six hundred forty thousand, six hundred ninety-three".