810844881660 has 144 divisors (see below), whose sum is σ = 2689219128960. Its totient is φ = 196124522880.

The previous prime is 810844881653. The next prime is 810844881697. The reversal of 810844881660 is 66188448018.

It is a happy number.

810844881660 is a `hidden beast` number, since 8 + 10 + 84 + 488 + 16 + 60 = 666.

It is a super-2 number, since 2×810844881660² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 810844881597 and 810844881606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 414931 + ... + 1339349.

It is an arithmetic number, because the mean of its divisors is an integer number (18675132840).

Almost surely, 2^810844881660 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 810844881660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1344609564480).

810844881660 is an abundant number, since it is smaller than the sum of its proper divisors (1878374247300).

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

810844881660 is a wasteful number, since it uses less digits than its factorization.

810844881660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924888 (or 924883 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 54.

The spelling of 810844881660 in words is "eight hundred ten billion, eight hundred forty-four million, eight hundred eighty-one thousand, six hundred sixty".