810819222164 has 48 divisors (see below), whose sum is σ = 1657202491392. Its totient is φ = 339882560352.

The previous prime is 810819222151. The next prime is 810819222197. The reversal of 810819222164 is 461222918018.

It is a super-2 number, since 2×810819222164² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1865579 + ... + 2258765.

It is an arithmetic number, because the mean of its divisors is an integer number (34525051904).

Almost surely, 2^810819222164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 810819222164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (828601245696).

810819222164 is an abundant number, since it is smaller than the sum of its proper divisors (846383269228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

810819222164 is a wasteful number, since it uses less digits than its factorization.

810819222164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394812 (or 394810 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 810819222164 in words is "eight hundred ten billion, eight hundred nineteen million, two hundred twenty-two thousand, one hundred sixty-four".