1378534223369 has 2 divisors, whose sum is σ = 1378534223370. Its totient is φ = 1378534223368.

The previous prime is 1378534223357. The next prime is 1378534223401. The reversal of 1378534223369 is 9633224358731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1361060556025 + 17473667344 = 1166645^2 + 132188^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378534223369 is a prime.

It is a super-2 number, since 2×1378534223369² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1378534222369) 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, 689267111684 + 689267111685.

It is an arithmetic number, because the mean of its divisors is an integer number (689267111685).

Almost surely, 2^{1378534223369} is an apocalyptic number.

It is an amenable number.

1378534223369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378534223369 is an equidigital number, since it uses as much as digits as its factorization.

1378534223369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 56.

The spelling of 1378534223369 in words is "one trillion, three hundred seventy-eight billion, five hundred thirty-four million, two hundred twenty-three thousand, three hundred sixty-nine".