1780138302689 has 2 divisors, whose sum is σ = 1780138302690. Its totient is φ = 1780138302688.

The previous prime is 1780138302641. The next prime is 1780138302721. The reversal of 1780138302689 is 9862038310871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1066898936464 + 713239366225 = 1032908^2 + 844535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1780138302689 - 2⁸ = 1780138302433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1780138304689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890069151344 + 890069151345.

It is an arithmetic number, because the mean of its divisors is an integer number (890069151345).

Almost surely, 2^{1780138302689} is an apocalyptic number.

It is an amenable number.

1780138302689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780138302689 is an equidigital number, since it uses as much as digits as its factorization.

1780138302689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 1780138302689 in words is "one trillion, seven hundred eighty billion, one hundred thirty-eight million, three hundred two thousand, six hundred eighty-nine".