2780558361389 has 2 divisors, whose sum is σ = 2780558361390. Its totient is φ = 2780558361388.

The previous prime is 2780558361337. The next prime is 2780558361407. The reversal of 2780558361389 is 9831638550872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1971404140489 + 809154220900 = 1404067^2 + 899530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2780558361389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780558361319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390279180694 + 1390279180695.

It is an arithmetic number, because the mean of its divisors is an integer number (1390279180695).

Almost surely, 2^{2780558361389} is an apocalyptic number.

It is an amenable number.

2780558361389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780558361389 is an equidigital number, since it uses as much as digits as its factorization.

2780558361389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87091200, while the sum is 65.

The spelling of 2780558361389 in words is "two trillion, seven hundred eighty billion, five hundred fifty-eight million, three hundred sixty-one thousand, three hundred eighty-nine".