811938663 has 12 divisors (see below), whose sum is σ = 1223791920. Its totient is φ = 517757856.

The previous prime is 811938643. The next prime is 811938667. The reversal of 811938663 is 366839118.

It is a happy number.

811938663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 811938663 - 2¹² = 811934567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811938667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1960998 + ... + 1961411.

It is an arithmetic number, because the mean of its divisors is an integer number (101982660).

Almost surely, 2^811938663 is an apocalyptic number.

811938663 is a deficient number, since it is larger than the sum of its proper divisors (411853257).

811938663 is a wasteful number, since it uses less digits than its factorization.

811938663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922438 (or 3922435 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 811938663 is about 28494.5374238642. The cubic root of 811938663 is about 932.9128477369.

The spelling of 811938663 in words is "eight hundred eleven million, nine hundred thirty-eight thousand, six hundred sixty-three".