1780540055209 has 2 divisors, whose sum is σ = 1780540055210. Its totient is φ = 1780540055208.

The previous prime is 1780540055183. The next prime is 1780540055221. The reversal of 1780540055209 is 9025500450871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1203628410000 + 576911645209 = 1097100^2 + 759547^2 .

It is a cyclic number.

It is not a de Polignac number, because 1780540055209 - 2¹³ = 1780540047017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1780540055509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890270027604 + 890270027605.

It is an arithmetic number, because the mean of its divisors is an integer number (890270027605).

Almost surely, 2^{1780540055209} is an apocalyptic number.

It is an amenable number.

1780540055209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780540055209 is an equidigital number, since it uses as much as digits as its factorization.

1780540055209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504000, while the sum is 46.

The spelling of 1780540055209 in words is "one trillion, seven hundred eighty billion, five hundred forty million, fifty-five thousand, two hundred nine".