812508705805 has 16 divisors (see below), whose sum is σ = 1026818337600. Its totient is φ = 615501141120.

The previous prime is 812508705773. The next prime is 812508705817. The reversal of 812508705805 is 508507805218.

It is not a de Polignac number, because 812508705805 - 2⁵ = 812508705773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1848631 + ... + 2245540.

It is an arithmetic number, because the mean of its divisors is an integer number (64176146100).

Almost surely, 2^812508705805 is an apocalyptic number.

It is an amenable number.

812508705805 is a deficient number, since it is larger than the sum of its proper divisors (214309631795).

812508705805 is a wasteful number, since it uses less digits than its factorization.

812508705805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096284.

The product of its (nonzero) digits is 896000, while the sum is 49.

The spelling of 812508705805 in words is "eight hundred twelve billion, five hundred eight million, seven hundred five thousand, eight hundred five".