806664811 has 4 divisors (see below), whose sum is σ = 807097824. Its totient is φ = 806231800.

The previous prime is 806664767. The next prime is 806664827. The reversal of 806664811 is 118466608.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 806664811 - 2¹¹ = 806662763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806464811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213700 + ... + 217441.

It is an arithmetic number, because the mean of its divisors is an integer number (201774456).

Almost surely, 2^806664811 is an apocalyptic number.

806664811 is a deficient number, since it is larger than the sum of its proper divisors (433013).

806664811 is a wasteful number, since it uses less digits than its factorization.

806664811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433012.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 806664811 is about 28401.8452041412. The cubic root of 806664811 is about 930.8885834081. Note that the first 3 decimals are identical.

The spelling of 806664811 in words is "eight hundred six million, six hundred sixty-four thousand, eight hundred eleven".