18218781578359 has 2 divisors, whose sum is σ = 18218781578360. Its totient is φ = 18218781578358.

The previous prime is 18218781578321. The next prime is 18218781578383. The reversal of 18218781578359 is 95387518781281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18218781578359 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18218781578291 and 18218781578300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18218781578159) 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, 9109390789179 + 9109390789180.

It is an arithmetic number, because the mean of its divisors is an integer number (9109390789180).

Almost surely, 2^{18218781578359} is an apocalyptic number.

18218781578359 is a deficient number, since it is larger than the sum of its proper divisors (1).

18218781578359 is an equidigital number, since it uses as much as digits as its factorization.

18218781578359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270950400, while the sum is 73.

The spelling of 18218781578359 in words is "eighteen trillion, two hundred eighteen billion, seven hundred eighty-one million, five hundred seventy-eight thousand, three hundred fifty-nine".