2780386643 has 2 divisors, whose sum is σ = 2780386644. Its totient is φ = 2780386642.

The previous prime is 2780386619. The next prime is 2780386667. The reversal of 2780386643 is 3466830872.

It is a balanced prime because it is at equal distance from previous prime (2780386619) and next prime (2780386667).

It is a cyclic number.

It is not a de Polignac number, because 2780386643 - 2¹⁸ = 2780124499 is a prime.

It is not a weakly prime, because it can be changed into another prime (2780386613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390193321 + 1390193322.

It is an arithmetic number, because the mean of its divisors is an integer number (1390193322).

Almost surely, 2^2780386643 is an apocalyptic number.

2780386643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780386643 is an equidigital number, since it uses as much as digits as its factorization.

2780386643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 47.

The square root of 2780386643 is about 52729.3717296157. The cubic root of 2780386643 is about 1406.1610515644.

The spelling of 2780386643 in words is "two billion, seven hundred eighty million, three hundred eighty-six thousand, six hundred forty-three".