818181818181839 has 2 divisors, whose sum is σ = 818181818181840. Its totient is φ = 818181818181838.

The previous prime is 818181818181811. The next prime is 818181818181853. The reversal of 818181818181839 is 938181818181818.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-818181818181839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818181818181869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409090909090919 + 409090909090920.

It is an arithmetic number, because the mean of its divisors is an integer number (409090909090920).

Almost surely, 2^{818181818181839} is an apocalyptic number.

818181818181839 is a deficient number, since it is larger than the sum of its proper divisors (1).

818181818181839 is an equidigital number, since it uses as much as digits as its factorization.

818181818181839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56623104, while the sum is 74.

The spelling of 818181818181839 in words is "eight hundred eighteen trillion, one hundred eighty-one billion, eight hundred eighteen million, one hundred eighty-one thousand, eight hundred thirty-nine".