18383728289887 has 2 divisors, whose sum is σ = 18383728289888. Its totient is φ = 18383728289886.

The previous prime is 18383728289873. The next prime is 18383728289891. The reversal of 18383728289887 is 78898282738381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18383728289887 - 2¹¹ = 18383728287839 is a prime.

It is a super-2 number, since 2×18383728289887² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18383728289887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18383728289287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9191864144943 + 9191864144944.

It is an arithmetic number, because the mean of its divisors is an integer number (9191864144944).

Almost surely, 2^{18383728289887} is an apocalyptic number.

18383728289887 is a deficient number, since it is larger than the sum of its proper divisors (1).

18383728289887 is an equidigital number, since it uses as much as digits as its factorization.

18383728289887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4161798144, while the sum is 82.

The spelling of 18383728289887 in words is "eighteen trillion, three hundred eighty-three billion, seven hundred twenty-eight million, two hundred eighty-nine thousand, eight hundred eighty-seven".