81818102887 has 2 divisors, whose sum is σ = 81818102888. Its totient is φ = 81818102886.

The previous prime is 81818102881. The next prime is 81818102893. The reversal of 81818102887 is 78820181818.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (81818102881) and next prime (81818102893).

It is a cyclic number.

It is not a de Polignac number, because 81818102887 - 2¹¹ = 81818100839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81818102881) 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, 40909051443 + 40909051444.

It is an arithmetic number, because the mean of its divisors is an integer number (40909051444).

Almost surely, 2^81818102887 is an apocalyptic number.

81818102887 is a deficient number, since it is larger than the sum of its proper divisors (1).

81818102887 is an equidigital number, since it uses as much as digits as its factorization.

81818102887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 458752, while the sum is 52.

The spelling of 81818102887 in words is "eighty-one billion, eight hundred eighteen million, one hundred two thousand, eight hundred eighty-seven".