80821105809 has 16 divisors (see below), whose sum is σ = 115355731200. Its totient is φ = 50179738896.

The previous prime is 80821105801. The next prime is 80821105811. The reversal of 80821105809 is 90850112808.

It is not a de Polignac number, because 80821105809 - 2³ = 80821105801 is a prime.

It is a super-2 number, since 2×80821105809² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80821105801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12012859 + ... + 12019584.

It is an arithmetic number, because the mean of its divisors is an integer number (7209733200).

Almost surely, 2^80821105809 is an apocalyptic number.

It is an amenable number.

80821105809 is a deficient number, since it is larger than the sum of its proper divisors (34534625391).

80821105809 is a wasteful number, since it uses less digits than its factorization.

80821105809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24032524.

The product of its (nonzero) digits is 46080, while the sum is 42.

The spelling of 80821105809 in words is "eighty billion, eight hundred twenty-one million, one hundred five thousand, eight hundred nine".