810819222163 has 4 divisors (see below), whose sum is σ = 810938836440. Its totient is φ = 810699607888.

The previous prime is 810819222151. The next prime is 810819222197. The reversal of 810819222163 is 361222918018.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-810819222163 is a prime.

It is a super-2 number, since 2×810819222163² (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 (810819222113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59796970 + ... + 59810527.

It is an arithmetic number, because the mean of its divisors is an integer number (202734709110).

Almost surely, 2^810819222163 is an apocalyptic number.

810819222163 is a deficient number, since it is larger than the sum of its proper divisors (119614277).

810819222163 is a wasteful number, since it uses less digits than its factorization.

810819222163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119614276.

The product of its (nonzero) digits is 82944, while the sum is 43.

The spelling of 810819222163 in words is "eight hundred ten billion, eight hundred nineteen million, two hundred twenty-two thousand, one hundred sixty-three".