18378789128369 has 2 divisors, whose sum is σ = 18378789128370. Its totient is φ = 18378789128368.

The previous prime is 18378789128363. The next prime is 18378789128383. The reversal of 18378789128369 is 96382198787381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17503245281344 + 875543847025 = 4183688^2 + 935705^2 .

It is a cyclic number.

It is not a de Polignac number, because 18378789128369 - 2⁴⁴ = 786603083953 is a prime.

It is a super-2 number, since 2×18378789128369² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18378789128293 and 18378789128302.

It is not a weakly prime, because it can be changed into another prime (18378789128363) 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, 9189394564184 + 9189394564185.

It is an arithmetic number, because the mean of its divisors is an integer number (9189394564185).

Almost surely, 2^{18378789128369} is an apocalyptic number.

It is an amenable number.

18378789128369 is a deficient number, since it is larger than the sum of its proper divisors (1).

18378789128369 is an equidigital number, since it uses as much as digits as its factorization.

18378789128369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1755758592, while the sum is 80.

The spelling of 18378789128369 in words is "eighteen trillion, three hundred seventy-eight billion, seven hundred eighty-nine million, one hundred twenty-eight thousand, three hundred sixty-nine".