812775788967 has 4 divisors (see below), whose sum is σ = 1083701051960. Its totient is φ = 541850525976.

The previous prime is 812775788897. The next prime is 812775789011. The reversal of 812775788967 is 769887577218.

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

It is not a de Polignac number, because 812775788967 - 2⁸ = 812775788711 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 (812785788967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135462631492 + ... + 135462631497.

It is an arithmetic number, because the mean of its divisors is an integer number (270925262990).

Almost surely, 2^812775788967 is an apocalyptic number.

812775788967 is a deficient number, since it is larger than the sum of its proper divisors (270925262993).

812775788967 is a wasteful number, since it uses less digits than its factorization.

812775788967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270925262992.

The product of its digits is 663828480, while the sum is 75.

The spelling of 812775788967 in words is "eight hundred twelve billion, seven hundred seventy-five million, seven hundred eighty-eight thousand, nine hundred sixty-seven".