809894055660 has 192 divisors, whose sum is σ = 2325309504000. Its totient is φ = 210561804288.

The previous prime is 809894055653. The next prime is 809894055661. The reversal of 809894055660 is 66550498908.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 809894055594 and 809894055603.

It is not an unprimeable number, because it can be changed into a prime (809894055661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 195012144 + ... + 195016296.

It is an arithmetic number, because the mean of its divisors is an integer number (12110987000).

Almost surely, 2^809894055660 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 809894055660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1162654752000).

809894055660 is an abundant number, since it is smaller than the sum of its proper divisors (1515415448340).

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

809894055660 is a wasteful number, since it uses less digits than its factorization.

809894055660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720 (or 4718 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 60.

The spelling of 809894055660 in words is "eight hundred nine billion, eight hundred ninety-four million, fifty-five thousand, six hundred sixty".