810169208836 has 45 divisors (see below), whose sum is σ = 1536518642771. Its totient is φ = 373783835568.

The previous prime is 810169208831. The next prime is 810169208869. The reversal of 810169208836 is 638802961018.

The square root of 810169208836 is 900094.

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

It can be written as a sum of positive squares in 2 ways, for example, as 401694834436 + 408474374400 = 633794^2 + 639120^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (810169208831) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 304230441 + ... + 304233103.

Almost surely, 2^810169208836 is an apocalyptic number.

810169208836 is the 900094-th square number.

It is an amenable number.

810169208836 is a deficient number, since it is larger than the sum of its proper divisors (726349433935).

810169208836 is an frugal number, since it uses more digits than its factorization.

810169208836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382 (or 2678 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 810169208836 in words is "eight hundred ten billion, one hundred sixty-nine million, two hundred eight thousand, eight hundred thirty-six".