809605220162 has 6 divisors (see below), whose sum is σ = 1214409738969. Its totient is φ = 404801973840.

The previous prime is 809605220089. The next prime is 809605220167. The reversal of 809605220162 is 261022506908.

It can be written as a sum of positive squares in 2 ways, for example, as 779673106081 + 29932114081 = 882991^2 + 173009^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=636241.

It is a super-2 number, since 2×809605220162² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809605220167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 954362 + ... + 1590602.

Almost surely, 2^809605220162 is an apocalyptic number.

809605220162 is a deficient number, since it is larger than the sum of its proper divisors (404804518807).

809605220162 is an frugal number, since it uses more digits than its factorization.

809605220162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272484 (or 636243 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 809605220162 in words is "eight hundred nine billion, six hundred five million, two hundred twenty thousand, one hundred sixty-two".