811818656 has 24 divisors (see below), whose sum is σ = 1743565824. Its totient is φ = 369008320.

The previous prime is 811818647. The next prime is 811818661. The reversal of 811818656 is 656818118.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1152800 + ... + 1153503.

It is an arithmetic number, because the mean of its divisors is an integer number (72648576).

Almost surely, 2^811818656 is an apocalyptic number.

It is an amenable number.

811818656 is an abundant number, since it is smaller than the sum of its proper divisors (931747168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811818656 is a wasteful number, since it uses less digits than its factorization.

811818656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306324 (or 2306316 counting only the distinct ones).

The product of its digits is 92160, while the sum is 44.

The square root of 811818656 is about 28492.4315564678. The cubic root of 811818656 is about 932.8668830216.

The spelling of 811818656 in words is "eight hundred eleven million, eight hundred eighteen thousand, six hundred fifty-six".