80821185220 has 24 divisors (see below), whose sum is σ = 173864112408. Its totient is φ = 31539974400.

The previous prime is 80821185173. The next prime is 80821185233. The reversal of 80821185220 is 2258112808.

It can be written as a sum of positive squares in 4 ways, for example, as 708411456 + 80112773764 = 26616^2 + 283042^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 80821185220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49280391 + ... + 49282030.

It is an arithmetic number, because the mean of its divisors is an integer number (7244338017).

Almost surely, 2^80821185220 is an apocalyptic number.

It is an amenable number.

80821185220 is an abundant number, since it is smaller than the sum of its proper divisors (93042927188).

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

80821185220 is a wasteful number, since it uses less digits than its factorization.

80821185220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98562471 (or 98562469 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 37.

The spelling of 80821185220 in words is "eighty billion, eight hundred twenty-one million, one hundred eighty-five thousand, two hundred twenty".