810564663 has 8 divisors (see below), whose sum is σ = 1105886848. Its totient is φ = 527809464.

The previous prime is 810564659. The next prime is 810564721. The reversal of 810564663 is 366465018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 810564663 - 2² = 810564659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810564163) 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 in 7 ways as a sum of consecutive naturals, for example, 3141595 + ... + 3141852.

It is an arithmetic number, because the mean of its divisors is an integer number (138235856).

Almost surely, 2^810564663 is an apocalyptic number.

810564663 is a deficient number, since it is larger than the sum of its proper divisors (295322185).

810564663 is a wasteful number, since it uses less digits than its factorization.

810564663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6283493.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 810564663 is about 28470.4173309771. The cubic root of 810564663 is about 932.3863112530.

The spelling of 810564663 in words is "eight hundred ten million, five hundred sixty-four thousand, six hundred sixty-three".