378755320409 has 2 divisors, whose sum is σ = 378755320410. Its totient is φ = 378755320408.

The previous prime is 378755320351. The next prime is 378755320417. The reversal of 378755320409 is 904023557873.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376351575625 + 2403744784 = 613475^2 + 49028^2 .

It is an emirp because it is prime and its reverse (904023557873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378755320409 - 2¹⁶ = 378755254873 is a prime.

It is not a weakly prime, because it can be changed into another prime (378755320429) 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, 189377660204 + 189377660205.

It is an arithmetic number, because the mean of its divisors is an integer number (189377660205).

Almost surely, 2^378755320409 is an apocalyptic number.

It is an amenable number.

378755320409 is a deficient number, since it is larger than the sum of its proper divisors (1).

378755320409 is an equidigital number, since it uses as much as digits as its factorization.

378755320409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 378755320409 in words is "three hundred seventy-eight billion, seven hundred fifty-five million, three hundred twenty thousand, four hundred nine".