2780843067389 has 2 divisors, whose sum is σ = 2780843067390. Its totient is φ = 2780843067388.

The previous prime is 2780843067361. The next prime is 2780843067421. The reversal of 2780843067389 is 9837603480872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1810214175364 + 970628892025 = 1345442^2 + 985205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2780843067389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780843067689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390421533694 + 1390421533695.

It is an arithmetic number, because the mean of its divisors is an integer number (1390421533695).

Almost surely, 2^{2780843067389} is an apocalyptic number.

It is an amenable number.

2780843067389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780843067389 is an equidigital number, since it uses as much as digits as its factorization.

2780843067389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97542144, while the sum is 65.

The spelling of 2780843067389 in words is "two trillion, seven hundred eighty billion, eight hundred forty-three million, sixty-seven thousand, three hundred eighty-nine".