1778817599441 has 2 divisors, whose sum is σ = 1778817599442. Its totient is φ = 1778817599440.

The previous prime is 1778817599411. The next prime is 1778817599491. The reversal of 1778817599441 is 1449957188771.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1743812686225 + 35004913216 = 1320535^2 + 187096^2 .

It is a cyclic number.

It is not a de Polignac number, because 1778817599441 - 2¹⁴ = 1778817583057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1778817599401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889408799720 + 889408799721.

It is an arithmetic number, because the mean of its divisors is an integer number (889408799721).

Almost surely, 2^{1778817599441} is an apocalyptic number.

It is an amenable number.

1778817599441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1778817599441 is an equidigital number, since it uses as much as digits as its factorization.

1778817599441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142248960, while the sum is 71.

The spelling of 1778817599441 in words is "one trillion, seven hundred seventy-eight billion, eight hundred seventeen million, five hundred ninety-nine thousand, four hundred forty-one".