818181818181811 has 2 divisors, whose sum is σ = 818181818181812. Its totient is φ = 818181818181810.

The previous prime is 818181818181797. The next prime is 818181818181839. The reversal of 818181818181811 is 118181818181818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 818181818181811 - 2³¹ = 818179670698163 is a prime.

It is not a weakly prime, because it can be changed into another prime (818181818185811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409090909090905 + 409090909090906.

It is an arithmetic number, because the mean of its divisors is an integer number (409090909090906).

Almost surely, 2^{818181818181811} is an apocalyptic number.

818181818181811 is a deficient number, since it is larger than the sum of its proper divisors (1).

818181818181811 is an equidigital number, since it uses as much as digits as its factorization.

818181818181811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2097152, while the sum is 64.

It can be divided in two parts, 8181818181818 and 11, that multiplied together give a palindrome (89999999999998).

The spelling of 818181818181811 in words is "eight hundred eighteen trillion, one hundred eighty-one billion, eight hundred eighteen million, one hundred eighty-one thousand, eight hundred eleven".