805500865009 has 3 divisors (see below), whose sum is σ = 805501762507. Its totient is φ = 805499967512.

The previous prime is 805500864953. The next prime is 805500865031. The reversal of 805500865009 is 900568005508.

It is a happy number.

The square root of 805500865009 is 897497.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 22757231025 + 782743633984 = 150855^2 + 884728^2 .

It is not a de Polignac number, because 805500865009 - 2¹⁹ = 805500340721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 805500865009.

It is not an unprimeable number, because it can be changed into a prime (805500865079) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 448749 + ... + 1346245.

Almost surely, 2^805500865009 is an apocalyptic number.

805500865009 is the 897497-th square number.

805500865009 is the 448749-th centered octagonal number.

It is an amenable number.

805500865009 is a deficient number, since it is larger than the sum of its proper divisors (897498).

805500865009 is an frugal number, since it uses more digits than its factorization.

805500865009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794994 (or 897497 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 805500865009 in words is "eight hundred five billion, five hundred million, eight hundred sixty-five thousand, nine".