810818663 has 2 divisors, whose sum is σ = 810818664. Its totient is φ = 810818662.

The previous prime is 810818623. The next prime is 810818677. The reversal of 810818663 is 366818018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 810818663 - 2¹⁰ = 810817639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 810818663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (810818623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405409331 + 405409332.

It is an arithmetic number, because the mean of its divisors is an integer number (405409332).

Almost surely, 2^810818663 is an apocalyptic number.

810818663 is a deficient number, since it is larger than the sum of its proper divisors (1).

810818663 is an equidigital number, since it uses as much as digits as its factorization.

810818663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 810818663 is about 28474.8777521520. The cubic root of 810818663 is about 932.4836924987.

The spelling of 810818663 in words is "eight hundred ten million, eight hundred eighteen thousand, six hundred sixty-three".