80820865212 has 96 divisors (see below), whose sum is σ = 202974777600. Its totient is φ = 24954365952.

The previous prime is 80820865211. The next prime is 80820865241. The reversal of 80820865212 is 21256802808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80820865211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1813614 + ... + 1857642.

It is an arithmetic number, because the mean of its divisors is an integer number (2114320600).

Almost surely, 2^80820865212 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 80820865212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101487388800).

80820865212 is an abundant number, since it is smaller than the sum of its proper divisors (122153912388).

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

80820865212 is a wasteful number, since it uses less digits than its factorization.

80820865212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44235 (or 44233 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The spelling of 80820865212 in words is "eighty billion, eight hundred twenty million, eight hundred sixty-five thousand, two hundred twelve".